
On
Core 3" Short
These lightweight running shorts from On feature a built-in microfibre brief and an elastic waistband with an adjustable inner drawstring. Made from stretch recycled polyester, they include two slant pockets and a rear zip pocket for essentials, plus a reflective logo. With a 3-inch (8 cm) inseam, they offer a mid-thigh fit for running and athletic activities.
- Material
- Stretch fabric made from recycled polyester, lightweight microfibre brief
- Gender
- unisex
- Style
- activewear, performance, minimalist
- Category
- Apparel & Accessories > Clothing > Activewear
Color
Size
Specifications
Ultra-light running shorts with built-in brief, elastic waist, and three pockets made from recycled polyester.
Ultra-lightweight, stretch fabric, built-in brief, elastic waist with adjustable drawstring, three pockets including zip pocket, reflective logo.
- Material
- Stretch fabric made from recycled polyester, lightweight microfibre brief
- Style
- activewear, performance, minimalist
- Occasion
- workout, sports-event
- Gender
- unisex
- Age Group
- adult
- Condition
- new
- Category
- Apparel & Accessories > Clothing > Activewear
Additional Attributes
- ultra-lightweight running shorts
- built-in brief
- elastic waistband
- adjustable inner drawstring
- three pockets: two slant pockets and one back zip pocket
- stretch fabric made from recycled polyester
- lightweight microfibre brief
- reflective logo
- 3-inch inseam
Product Insights
On's Core 3" Short uses four-way stretch recycled polyester with side slits for unrestricted movement, though the permanently sewn-in microfibre brief cannot be removed. At $80 CAD, it undercuts Lululemon Speed Up and aligns with Hotty Hot, fitting true to size with an elastic waistband that minimizes rolling. A bestseller, it serves as everyday wear beyond running.
Verified claims
- Stretch
- Four-way stretch recycled polyester fabric with hem side slits provides unrestricted movement.
- Price value
- At $80 CAD ($60 USD), undercuts Lululemon Speed Up and aligns with Hotty Hot.
- Fit
- Runs true to size; elastic waistband with drawstring minimizes rolling.
- Design features
- Features side slits for mobility and a permanently sewn-in microfibre brief that cannot be removed.
- Bestseller status
- On labels it a bestseller; critics call On one of the best.
- Sizing
- True to size; size down for a snugger fit.
- Mobility
- Four-way stretch and conservative side slits enable mobility without exposing the thigh.
- Built-in brief
- Built-in microfibre brief is permanently sewn in and not removable.
- Everyday style
- Subtle design and bestseller status validate everyday use beyond running.
- Waistband
- Elastic waistband with adjustable drawstring minimizes waistband rolling.
Product record
- Title
- Core 3" Short
- Brand
- On
- Price
- 80 CAD
- Availability
- In stock
Image Analysis
3 images- 01

Product
Pair of black athletic shorts on a standing model; elastic waistband, mid-thigh length, and a small white logo near the left hem are visible.
- Overall shapeMid-rise athletic shorts with a relaxed, slightly flared leg opening and mid-thigh length visible from the front-left three-quarter angle.
1 region
x 0.22 · y 0.42 · w 0.34 · h 0.25 (high) - WaistbandElasticated waistband with gathered fabric; no visible drawstring from this view.
1 region
x 0.30 · y 0.42 · w 0.20 · h 0.06 (high) - Side seam and hemClean side seam and single-fold hem with a short outer slit at the leg opening on the model's left side.
1 region
x 0.22 · y 0.50 · w 0.20 · h 0.12 (medium) - Left-hem logo“Small white lowercase 'on' logo printed near the left outer hem.”
1 region
x 0.20 · y 0.53 · w 0.05 · h 0.05 (high) - Fabric appearanceSmooth, matte woven fabric with minimal visible texture and slight sheen from lighting on creased areas.
Other
Studio lifestyle shot of a standing model against a plain white background, wearing additional visible garments and shoes; bright even lighting with soft shadows on the floor.
- Model poseFemale model standing in a left-facing three-quarter pose with hands behind back, showing front-left view of the shorts.
1 region
x 0.08 · y 0.03 · w 0.84 · h 0.94 (high) - Visible additional garmentsBlack sports bra is worn by the model above the shorts; visible but described only as additional garment, not part of the listed product.
1 region
x 0.22 · y 0.08 · w 0.33 · h 0.21 (high) - Shoe text“HOKA”
1 region
x 0.38 · y 0.83 · w 0.20 · h 0.10 (high) - Background and lightingPlain seamless white background and floor with even, diffused lighting and soft floor shadow under model's feet.
Colors
black· shorts main fabric#151414white· left-hem logo#F4F4F4- Overall shapeMid-rise athletic shorts with a relaxed, slightly flared leg opening and mid-thigh length visible from the front-left three-quarter angle.
- 02

Product
Black woven athletic shorts with an elastic gathered waistband, vertical center-front seam, inset side pockets, straight hem with small side vent, and a small reflective brand logo near the lower left hem.
- WaistbandElastic gathered waistband with visible rows of stitching; sits at the natural waist of the model and has a slightly denser gather than the short body fabric.
1 region
x 0.18 · y 0.34 · w 0.64 · h 0.12 (high) - Side pocket with handInset side pocket on the left side containing the model's hand; pocket opening is vertical and integrated into the side seam.
1 region
x 0.02 · y 0.50 · w 0.30 · h 0.30 (high) - Center front seamA single vertical seam runs down the center front of the shorts, visible as a subtle stitch line from waistband toward hem.
1 region
x 0.46 · y 0.46 · w 0.12 · h 0.50 (high) - Hem and side ventStraight hem with a short side vent at the outer left hem; hem is neatly topstitched.
1 region
x 0.02 · y 0.80 · w 0.48 · h 0.18 (high) - Fabric appearanceSmooth, lightweight woven fabric with a matte finish and small soft wrinkles; no visible knit texture.
1 region
x 0.18 · y 0.46 · w 0.64 · h 0.44 (high) - Brand mark near hem“Small stylized brand mark reading 'on' in lowercase, positioned near the lower left front hem and contrasting in a light color.”
1 region
x 0.04 · y 0.78 · w 0.12 · h 0.12 (high)
Other
Cropped studio shot showing the model's midsection and upper thighs against a neutral light background; soft even lighting with minimal shadows and slight reflection on fabric. Model's torso and a black crop top are visible but are not part of the product description.
- Shot compositionCropped portrait-style studio photo framing the model from just below the chest to mid-thigh, showing front and slight left-side of the shorts.
- BackgroundEven light gray to white seamless background with no pattern or props.
- Model hand and poseModel's left hand is inserted into the left pocket; right hand hangs at the model's side partially visible at the lower right of the frame.
2 regions
x 0.00 · y 0.44 · w 0.26 · h 0.34 (high); x 0.76 · y 0.78 · w 0.22 · h 0.18 (medium) - Lighting and shadowSoft, diffuse studio lighting producing faint, soft shadows under the waistband and hem and a small specular on the fabric folds.
Colors
deep black· shorts body#1A191Ebright white· brand mark- WaistbandElastic gathered waistband with visible rows of stitching; sits at the natural waist of the model and has a slightly denser gather than the short body fabric.
- 03

Product
Black athletic shorts shown from the rear with an elastic gathered waistband, a right-side rear pocket with a flap, a left hem side slit, and a small white logo on the lower left front-facing hem.
- Overall silhouetteMid-rise loose-fit athletic short visible from the rear with a straight short hem and a slight outward flare at the leg openings.
1 region
x 0.05 · y 0.44 · w 0.90 · h 0.48 (high) - WaistbandElastic gathered waistband in the same dark fabric, forming small horizontal gathers around the entire waist visible from the rear.
1 region
x 0.22 · y 0.28 · w 0.56 · h 0.12 (high) - Rear pocket with flapRight-side rear pocket with a horizontal flap that sits just below the waistband; flap edge visible and lies flat against the shorts.
1 region
x 0.64 · y 0.36 · w 0.22 · h 0.12 (high) - Right rear pocket text“SWISS ENGINEERED”Partial
1 region
x 0.75 · y 0.36 · w 0.12 · h 0.05 (medium) - Left hem side slitSmall vertical side slit at the left leg hem creating an angled opening at the outer seam.
1 region
x 0.04 · y 0.79 · w 0.16 · h 0.15 (high) - Front-facing left logo“Small white stylized two-letter logo near the lower left front-facing hem.”
1 region
x 0.08 · y 0.82 · w 0.09 · h 0.11 (high) - Fabric appearanceSmooth, slightly matte woven fabric with minimal surface texture and faint seam lines visible across the rear and along panels.
1 region
x 0.18 · y 0.44 · w 0.64 · h 0.48 (high) - Center rear seamVertical seam running down the center rear of the shorts aligning with the seat area.
1 region
x 0.49 · y 0.46 · w 0.02 · h 0.37 (high)
Other
Model wearing the shorts shown from the rear; plain light neutral background; additional visible garment (black sports bra) and studio lighting with soft shadows.
- Model and poseFemale model shown from the rear with hands resting near hips, torso and upper legs visible above and below the shorts.
1 region
x 0.12 · y 0.02 · w 0.76 · h 0.98 (high) - Additional garment visibleBlack sports bra with cross-back straps and a horizontal cutout band across the lower back is visible above the shorts; this is a separate garment from the shorts.
1 region
x 0.19 · y 0.02 · w 0.62 · h 0.34 (high) - Background and lightingPlain off-white studio background with even soft lighting and minimal shadows.
- Image crop and compositionImage is vertically framed to show mid-back down to mid-thigh; lower legs and head are cropped out.
Colors
dark charcoal· main fabric#1A191Ewhite· logo- Overall silhouetteMid-rise loose-fit athletic short visible from the rear with a straight short hem and a slight outward flare at the leg openings.