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Polyester","size_system":"US","gender":"male","is_digital":"false","review_count":4,"q_and_a":[{"a":"To preserve Polygiene anti-odour technology, wash in cold water with a mild detergent, avoid bleach and fabric softeners, and tumble dry on low heat or air dry. High heat can damage the silver salt treatment.","q":"What are the recommended washing and drying instructions to preserve the Polygiene anti-odour technology?"},{"a":"The microfibre fabric has a matte finish. This is typical of recycled polyester microfibre used in athletic trunks, which prioritises a non-reflective look.","q":"Does the microfibre fabric have a shiny or matte finish?"},{"a":"These trunks run true to standard US/Canadian sizing. A size chart on the Simons website shows measurements: Small 28-30\", Medium 31-33\", Large 34-36\", X-Large 37-39\" (waist). Most customer reviews confirm they fit as expected.","q":"How does the sizing of these trunks compare to standard US or Canadian sizes? Do they run true to size?"},{"a":"The micro-perforated panels are unlikely to be visible through most thin pants, as the holes are tiny and intended for ventilation rather than visual effect. They are located on sides and back, not front, so they typically remain hidden.","q":"Are the micro-perforated panels visible through lightweight or thin pants?"}],"reviews":[{"date":"January 11, 2026","title":"So far so perfect","rating":5,"content":"I’m very fussy about my underwear, as are a lot of men. Don’t let the thread-worn condition of our underwear fool you . It’s more of a fear of letting go until we’ve found a suitable replacement for our “lucky” underwear. It’s a personal choice of course,,but these tick the boxes for me. They are form fitting with 15% spandex, more than double what a lot of brands include. They maintain their support from the moment you put them on until you take them off. I’ve only worn them 2 times so far, so they’ve been washed 2 times. I wash everything before first wearing it. I followed the suggested wash instructions, however, I hang them to dry. Anything with a bit of stretch to it, lasts much longer if you don’t put them in the dryer. The heat will break down the stretchy fibers and over time it becomes shapeless and lumpy. So far these are the best underwear I have owned right out of the gate. Time will tell if they hold up and remain as such.","reviewer_name":"Rob B."},{"date":"March 5, 2026","title":"Confortable","rating":5,"content":"Bon et pas cher!","reviewer_name":"Jean-Pierre V."},{"date":"July 15, 2026","title":"Super confort","rating":5,"content":"Bonne tenue, reste en place et bon support","reviewer_name":"Francine V."},{"date":"March 19, 2026","title":"Confortable","rating":4,"content":"Confortable","reviewer_name":"Dave P."}],"target_countries":"US","canonical_url":"https://www.simons.ca/en/men-underwear/boxers-briefs/trunks/3-microfibre-athletic-trunk-retransformed-polyester--11003-220455?colourId=0","deep_research":{"dimensions":{"polygiene_odor_technology":{"title":"How the Polygiene anti-odour treatment works","entries":{"ventilation_synergy":"Micro-perforated panels vent heat and moisture from the groin and glute areas, depriving odor-causing bacteria of the warmth and humidity they require to proliferate, while the Polygiene silver salt neutralizes any remaining microbial activity — a two-stage defence system that works better than either approach alone.","fewer_washes_longer_life":"Because the anti-odor treatment keeps the trunk smelling fresh, it can be worn multiple times between machine cycles — which not only saves water and energy but also reduces the fiber wear that causes athletic undergarments to thin and stretch prematurely.","recycled_silver_salt_input":"The active silver salt is derived from recycled silver, pairing with the trunk’s own recycled polyester construction to create a garment with both post-consumer fiber and a circular-materials antimicrobial agent.","lifetime_of_garment_durability":"Polygiene’s treatment is designed to last the full life of the product, not wash out after a set number of cycles; as the fabric abrades with ordinary wear, newly exposed surfaces remain antimicrobial, so the trunk’s odor control persists for its entire usable lifespan.","triple_action_antibacterial_mechanism":"Polygiene Stays Fresh uses silver ions to inhibit odor-causing bacteria through three distinct pathways — disrupting cell walls, interfering with DNA replication, and blocking energy production — making the treatment robust rather than a single-point-of-failure surface coating."},"entry_quotes":{"ventilation_synergy":[{"url":"https://modesens.com/product/le-31-3-microfibre-athletic-trunk-114673743/","quote":"Micro-perforated panels for ventilation of heat-prone areas"},{"url":"https://polygiene.com/antibacterial-workout-clothes/","quote":"bacteria love warm and damp environments"}],"fewer_washes_longer_life":[{"url":"https://polygiene.com/care/","quote":"Only wash it when absolutely necessary. The fewer times a product is washed, the longer it will last, and the lower its environmental impact will be."}],"recycled_silver_salt_input":[{"url":"https://modesens.com/product/le-31-3-microfibre-athletic-trunk-114673743/","quote":"using silver salt made from recycled silver"}],"lifetime_of_garment_durability":[{"url":"https://www.flowcrete.eu/media/9966/polygienedurability-2013.pdf","quote":"Products containing Polygiene antimicrobial technology is designed to last the life time of the product in normal use. Wear and tear of the product will open up new surfaces with antimicrobial effect."}],"triple_action_antibacterial_mechanism":[{"url":"https://polygiene.com/antibacterial-workout-clothes/","quote":"The technology works to prevent bacterial growth on three levels.\n1. It binds to the cell wall to disrupt growth.\n2. It interferes with bacterial DNA to prevent cellular replication.\n3. It interrupts enzyme action to prevent energy production."}]},"entry_sources":{"ventilation_synergy":["https://modesens.com/product/le-31-3-microfibre-athletic-trunk-114673743/","https://polygiene.com/antibacterial-workout-clothes/"],"fewer_washes_longer_life":["https://polygiene.com/care/"],"recycled_silver_salt_input":["https://modesens.com/product/le-31-3-microfibre-athletic-trunk-114673743/"],"lifetime_of_garment_durability":["https://www.flowcrete.eu/media/9966/polygienedurability-2013.pdf"],"triple_action_antibacterial_mechanism":["https://polygiene.com/antibacterial-workout-clothes/"]}},"micro_perforated_ventilation":{"title":"How the micro-perforated panels increase airflow","entries":{"zonal_perforation_layout":"The micro-perforations are restricted to the sides and back — the zones richest in eccrine sweat glands — so ventilation is concentrated where thermal load peaks, while the front panel remains solid for a clean silhouette under shorts.","dynamic_air_pumping_action":"During running or cycling, the stretch-and-recover motion of the hip and lower back flex zones repeatedly compresses the perforated fabric, forcing warm, humid air out and drawing cooler ambient air in, which amplifies the cooling effect beyond what static perforations would provide.","moisture_evacuation_pairing":"The recycled polyester microfibre spreads sweat into a thin film that evaporates fast, but without airflow the vapour can become trapped; the perforations act as thousands of micro-vents that let this water vapour escape, keeping the fabric drier and less clingy than a solid-weave trunk.","anti_odour_system_reinforcement":"Polygiene's silver-salt technology neutralizes odour-causing bacteria on contact, and the micro-perforations deprive surviving bacteria of the moisture they need to multiply, creating a two-pronged freshness strategy that extends wear-time between washes."}}}},"handle":"3-microfibre-athletic-trunk-retransformed-polyester-11003-220455","storefront_path":"/en/men-underwear/boxers-briefs/trunks/3-microfibre-athletic-trunk-retransformed-polyester--11003-220455","storefront_url":"https://ai.simons.ca/en/men-underwear/boxers-briefs/trunks/3-microfibre-athletic-trunk-retransformed-polyester--11003-220455"}}