{"product":{"catalog_id":"05ad5460-d55d-4b24-91e4-5162fd162fbf","is_eligible_search":true,"is_eligible_checkout":false,"item_id":"eaf75c71-dbd9-4000-a0ec-705af4a4ab77","title":"Ultrathin No-Show Boyshort Period Panty Absorption: Moderate","description":"This is the Knix UltraThin No-Show boyshort period panty, a moderate-absorption garment (equivalent to 2.5 regular tampons) designed for menstrual flow, light bladder leaks, and sweat. It features a patented 360 LeakSeal gusset trim for multi-angle leak protection, a silky stretch nylon-blend microfibre with liquid-resistant fabric, and a seamless boyshort cut for a discreet fit under clothing. 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Blue","option2":"MEDIUM","image_url":"https://imagescdn.simons.ca/images/22786/26001/45/A1_2.jpg","variant_id":"4576845","availability":"in_stock"},{"sku":"4576846","url":"https://www.simons.ca/en/women-underwear/panties/period-underwear/ultrathin-no-show-boyshort-period-panty-absorption-moderate--22786-26001?colourId=45","image":{"id":"img-variant-4576846","url":"https://imagescdn.simons.ca/images/22786/26001/19/A1_2.jpg","alt_text":"UltraThin No-Show boyshort period panty Absorption: moderate - Baby Blue - LARGE variant image","position":14,"variant_ids":["4576846"]},"price":{"value":34,"currency":"CAD"},"title":"Ultrathin No-Show Boyshort Period Panty Absorption: Moderate - Baby Blue - Large","option1":"Baby Blue","option2":"LARGE","image_url":"https://imagescdn.simons.ca/images/22786/26001/45/A1_2.jpg","variant_id":"4576846","availability":"in_stock"},{"sku":"4576847","url":"https://www.simons.ca/en/women-underwear/panties/period-underwear/ultrathin-no-show-boyshort-period-panty-absorption-moderate--22786-26001?colourId=45","image":{"id":"img-variant-4576847","url":"https://imagescdn.simons.ca/images/22786/26001/19/A1_2.jpg","alt_text":"UltraThin No-Show boyshort period panty Absorption: moderate - Baby Blue - X-LARGE variant image","position":15,"variant_ids":["4576847"]},"price":{"value":34,"currency":"CAD"},"title":"Ultrathin No-Show Boyshort Period Panty Absorption: Moderate - Baby Blue - X-Large","option1":"Baby Blue","option2":"X-LARGE","image_url":"https://imagescdn.simons.ca/images/22786/26001/45/A1_2.jpg","variant_id":"4576847","availability":"in_stock"}],"item_group_title":"Ultrathin No-Show Boyshort Period Panty Absorption: Moderate","size_system":"US","gender":"female","is_digital":"false","review_count":1,"q_and_a":[{"a":"The moderate absorbency (2.5 tampons) is best suited for light-to-moderate flow days. Users with heavier flow may find it insufficient for overnight or a full workday without backup. For heavy flow, we recommend our higher-absorbency options.","q":"How does the moderate absorption level (2.5 tampons) hold up overnight or for a full workday – do users report leaks with heavier flow?"},{"a":"The strategic seamless construction and buttery-soft fabric are designed to be invisible under clothes, including leggings. Reviews for similar Knix boyshorts confirm they stay in place without visible panty lines, though individual fit may vary.","q":"Does the boyshort cut tend to ride up or cause visible panty lines under leggings or tight clothing, despite the 'no-show' claim?"},{"a":"Machine wash cold, do not bleach, and lay flat to dry — do not put in the dryer as heat can damage the leak-proof layers and elastic. Wring gently and air dry to maintain performance.","q":"What is the recommended washing routine to maintain the leak-proof layers and elastic – can it go in the dryer or does it require air drying?"},{"a":"The silky nylon-blend microfibre is breathable for all-day comfort, and the cotton gusset adds moisture-wicking. It's suitable for light activity and warm weather, but for heavy exercise or extreme heat, you may prefer a moisture-wicking athletic style.","q":"How breathable is the silky nylon-blend microfibre for all-day wear, especially during exercise or hot weather?"},{"a":"The 360 LeakSeal gusset trim is designed to lock in leaks from all angles and works effectively for both periods and light bladder leaks. The product listing explicitly states it's perfect for periods, urine leakage, and sweat, so it's optimized for both use cases.","q":"Does the 360 LeakSeal gusset trim work effectively for both periods and light bladder leaks, or is it optimized for one use case?"}],"reviews":[{"date":"April 8, 2026","title":"When you cough or sneeze!","rating":5,"content":"Work well for small bladder leaks","reviewer_name":"Marny D."}],"target_countries":"US","canonical_url":"https://www.simons.ca/en/women-underwear/panties/period-underwear/ultrathin-no-show-boyshort-period-panty-absorption-moderate--22786-26001?colourId=19","deep_research":{"dimensions":{"care_and_longevity_tips":{"title":"Care tips to maximize the panty's lifespan","entries":{"mesh_laundry_bag":"Washing the Ultrathin No-Show in a mesh bag on a gentle cycle minimizes abrasion against the silky nylon-blend microfibre and seamless edges, reducing the pilling and seam stress that can develop into holes or fraying over the panty's typical multi-year lifespan.","fabric_softener_and_bleach_prohibition":"Knix explicitly warns against fabric softener and bleach because they coat or degrade the absorbent fibers in the gusset, which would erode the panty's moderate absorbency rating of 2.5 regular tampons long before the nylon-blend microfiber shows signs of wear.","absorbency_decline_as_replacement_signal":"Knix period underwear is designed to last several years with proper care, but the absorbent core degrades over time; the practical trigger to replace a pair is when the boyshort no longer provides full-day or full-night protection at its moderate 2.5-tampon level—not a set calendar date."},"entry_quotes":{"mesh_laundry_bag":[{"url":"https://knix.ca/blogs/resources/how-long-does-period-underwear-last-your-guide-to-extending-the-life-of-your-favorite-period-undies","quote":"It’s also a good idea to wash them on a gentle cycle, or use a mesh bag, to protect them from damage."}],"fabric_softener_and_bleach_prohibition":[{"url":"https://knix.ca/blogs/resources/how-long-does-period-underwear-last-your-guide-to-extending-the-life-of-your-favorite-period-undies","quote":"NEVER use bleach or fabric softener, as it can degrade the absorbency"}],"absorbency_decline_as_replacement_signal":[{"url":"https://knix.ca/blogs/resources/how-long-does-period-underwear-last-your-guide-to-extending-the-life-of-your-favorite-period-undies","quote":"They’re not absorbing as much as they used to. If you’re noticing your period panties used to get you through the day (or night) and aren’t anymore, it’s time to let them go."}]},"entry_sources":{"mesh_laundry_bag":["https://knix.ca/blogs/resources/how-long-does-period-underwear-last-your-guide-to-extending-the-life-of-your-favorite-period-undies"],"fabric_softener_and_bleach_prohibition":["https://knix.ca/blogs/resources/how-long-does-period-underwear-last-your-guide-to-extending-the-life-of-your-favorite-period-undies","https://knix.ca/blogs/knix-blog/washing-period-underwear"],"absorbency_decline_as_replacement_signal":["https://knix.ca/blogs/resources/how-long-does-period-underwear-last-your-guide-to-extending-the-life-of-your-favorite-period-undies"]}},"leakseal_trim_technology":{"title":"What the patented LeakSeal trim actually does","entries":{"100_polyurethane_coating_barrier":"The gusset construction includes a dedicated 100% polyurethane coating — the key component of the patented 360 LeakSeal™ trim — which acts as a flexible but impermeable barrier around the gusset's perimeter, preventing fluid from escaping beyond the absorbent zone even when you're lying down or active.","patented_across_canada_us_and_europe":"The LeakSeal gusset design is protected by patents CA 2,942,869, US 10,441,479/US 10,441,480/US 11,737,931, and EP 2991605, making the edge-sealing technology a proprietary innovation that generic period underwear cannot legally replicate — a signal that the performance you're paying for has defendable engineering behind it."},"entry_quotes":{"patented_across_canada_us_and_europe":[{"url":"https://knix.com/pages/patents","quote":"● Canada: CA 2,942,869● Europe: EP 2991605 (validated in France, Germany, Norway, Sweden, UK)● US: US 10,441,479; US 10,441,480; US 11,737,931"}]},"entry_sources":{"patented_across_canada_us_and_europe":["https://knix.com/pages/patents"]}},"lycra_xtra_life_durability":{"title":"How Lycra XTRA LIFE spandex extends garment life","entries":{"lycra_xtra_life_10x_durability_technology":"This panty's Lycra XTRA LIFE fiber is the same durability technology that makes swimwear last up to 10x longer than standard spandex; here, it's tasked with resisting the repeated wash and dry cycles period underwear faces, so the boyshort holds its shape and fit through dozens of launderings rather than bagging out."},"entry_quotes":{"lycra_xtra_life_10x_durability_technology":[{"url":"https://www.lycra.com/en/business/search-technologies/lycra-xtra-life-fiber","quote":"LASTS UP TP 10X LONGER THAN ORDINARY SPANDEX/ELASTANE FIBERS"},{"url":"https://www.lycra.com/en/business/search-technologies/lycra-xtra-life-brand","quote":"LYCRA XTRA LIFE® brand underwear hold their fit and shape for longer, standing up to frequent washing"}]},"entry_sources":{"lycra_xtra_life_10x_durability_technology":["https://www.lycra.com/en/business/search-technologies/lycra-xtra-life-fiber","https://www.lycra.com/en/business/search-technologies/lycra-xtra-life-brand"]}},"gusset_layered_construction":{"title":"How the gusset layers work together","entries":{"double_core_absorbency":"Rather than a single thick pad, the absorbent section uses two distinct polyester layers (96% and 89% polyester blends) in a stacked configuration — a technique that period-underwear engineers favor because multiple lower-density layers distribute fluid laterally and resist saturation better than one heavy core, allowing the Ultrathin silhouette to still manage a moderate 2.5-tampon capacity.","four_layer_gusset_stack":"The gusset is built as a four-layer sandwich: a cotton-carbon face for softness and wicking, two separate polyester absorbent cores that collectively hold 2.5 super tampons' worth of fluid, and a polyurethane barrier that waterproofs without trapping heat — each layer is optimized for a single function, which is how the panty achieves moderate absorbency in an ultrathin, no-show profile.","360_leakseal_edge_bonding":"The patented 360° LeakSeal trim is a bonded finish that encases the raw edges of the gusset, sealing the microscopic needle holes created during stitching — the primary route for leaks in traditional period underwear — so the panty can handle lateral movement and overnight shifting without fluid escaping at the sides.","breathable_polyurethane_membrane":"The final polyurethane coating is a microporous TPU film: its pores are engineered to be large enough for sweat vapor to escape but small enough to block liquid menstrual fluid, so the panty doesn't create the sweaty, non-breathable seal that older waterproof backings caused — a critical factor for comfort during a full day of wear."},"entry_quotes":{"double_core_absorbency":[{"url":"https://ljunderwear.com/ru/period-underwear-gusset-construction-tech-pack-guide/","quote":"The core is often built from multiple layers of lower-GSM fabric rather than a single high-GSM fabric — the layered construction performs better than equivalent-weight single-layer."}],"360_leakseal_edge_bonding":[{"url":"https://www.ljvogues.com/premium-period-underwear-materials-explained.html","quote":"When a sewing needle passes through the TPU laminated layer, it creates a microscopic hole. If left untreated, fluid will wick through these needle holes and leak onto the wearer's clothing."},{"url":"https://www.ljvogues.com/premium-period-underwear-materials-explained.html","quote":"Binding and Fold-Over Elastics: Encasing the raw edges of the gusset to trap fluid."}],"breathable_polyurethane_membrane":[{"url":"https://www.ljvogues.com/premium-period-underwear-materials-explained.html","quote":"TPU is microporous. The microscopic pores in the film are small enough to block liquid water molecules (menstrual fluid) but large enough to allow water vapor molecules (sweat and body heat) to pass through."}]},"entry_sources":{"double_core_absorbency":["https://ljunderwear.com/ru/period-underwear-gusset-construction-tech-pack-guide/"],"360_leakseal_edge_bonding":["https://www.ljvogues.com/premium-period-underwear-materials-explained.html"],"breathable_polyurethane_membrane":["https://www.ljvogues.com/premium-period-underwear-materials-explained.html"]}},"competitive_market_positioning":{"title":"How it stacks up against similar period boyshorts","entries":{"lycra_xtra_life_spandex":"The outer fabric uses 23% Lycra XTRA LIFE spandex, a high-resilience stretch fiber typically reserved for premium activewear and swimwear, which prevents the sagging and bagging that often plague all-day period panties after multiple washes.","360_leakseal_gusset_trim":"Knix's patented 360 LeakSeal trim creates a liquid-proof fence around the gusset, preventing the edge-wicking that can occur in standard period panties during sleep or movement—a feature absent from Thinx's stitched-in gusset and Modibodi's wool patch.","absorbency_rating_vs_peer_brands":"At 2.5 tampons, Knix's moderate absorbency matches Thinx's Moderate tier (2–3 tampons) and is substantially lighter than Modibodi's Moderate (up to 6 tampons), so this boyshort is calibrated for light-to-moderate days where a slim, discreet profile matters more than maximum capacity.","price_against_direct_competitors":"At $34 CAD (≈$25 USD), the Knix boyshort undercuts the Modibodi Classic Boyshort (regularly $55 USD) by nearly half, while sitting at the lower end of Thinx's premium range ($17–$61 USD), making it a compelling entry point for a full-featured moderate-protection panty.","carbon_cotton_gusset_vs_merino_and_synthetic":"Knix's gusset blends cotton with 4% carbon fiber for its absorbent and odor-control properties, offering a vegan, plant-based alternative to Modibodi's merino wool and a more natural-tech approach than Thinx's synthetic quad-dry-tech layering."},"entry_quotes":{"absorbency_rating_vs_peer_brands":[{"url":"https://greenlitcontent.com/resources/thinx-vs-knix-review","quote":"Moderate Days (replaces 2-3 regular tampons)"},{"url":"https://us.modibodi.com/products/classic-boyshort-moderate-black","quote":"Flow: ModerateAbsorbency: 30 mlsTampons Equivalent: Up to 6 tampons*"}],"price_against_direct_competitors":[{"url":"https://us.modibodi.com/products/classic-boyshort-moderate-black","quote":"Classic Boyshort $46.74 $54.99"},{"url":"https://www.ljvogues.com/knix-vs-thinx-vs-saalt.html","quote":"| Price Range | $22–$48 | $17–$61 |"}],"carbon_cotton_gusset_vs_merino_and_synthetic":[{"url":"https://www.thefrugalgirl.com/a-review-of-thinx-and-knix-from-a-household-of-ladies/","quote":"Knix period underwear are not chemically treated for absorbency improvement, rather they are made of cotton, woven with carbon and spandex, with tiny holes for more absorbency."},{"url":"https://us.modibodi.com/products/classic-boyshort-moderate-black","quote":"Made with natural, renewable and super-soft merino wool"}]},"entry_sources":{"absorbency_rating_vs_peer_brands":["https://greenlitcontent.com/resources/thinx-vs-knix-review","https://us.modibodi.com/products/classic-boyshort-moderate-black"],"price_against_direct_competitors":["https://us.modibodi.com/products/classic-boyshort-moderate-black","https://www.ljvogues.com/knix-vs-thinx-vs-saalt.html"],"carbon_cotton_gusset_vs_merino_and_synthetic":["https://www.thefrugalgirl.com/a-review-of-thinx-and-knix-from-a-household-of-ladies/","https://us.modibodi.com/products/classic-boyshort-moderate-black","https://greenlitcontent.com/resources/thinx-vs-knix-review"]}}}},"handle":"ultrathin-no-show-boyshort-period-panty-absorption-moderate-22786-26001","storefront_path":"/en/women-underwear/panties/period-underwear/ultrathin-no-show-boyshort-period-panty-absorption-moderate--22786-26001","storefront_url":"https://ai.simons.ca/en/women-underwear/panties/period-underwear/ultrathin-no-show-boyshort-period-panty-absorption-moderate--22786-26001"}}