Core 3" short product image (primary)
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.

On

Core 3" Short

CA$80.00CAD
In Stock

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

BlackSlate GreyOrange

Size

SMALLMEDIUMLARGEX-SMALL

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
Core 3" short product image (primary)
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 regionx 0.22 · y 0.42 · w 0.34 · h 0.25 (high)
  • WaistbandElasticated waistband with gathered fabric; no visible drawstring from this view.
    1 regionx 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 regionx 0.22 · y 0.50 · w 0.20 · h 0.12 (medium)
  • Left-hem logoSmall white lowercase 'on' logo printed near the left outer hem.
    1 regionx 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 regionx 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 regionx 0.22 · y 0.08 · w 0.33 · h 0.21 (high)
  • Shoe textHOKA
    1 regionx 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
Core 3" short product image 2
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 regionx 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 regionx 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 regionx 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 regionx 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 regionx 0.18 · y 0.46 · w 0.64 · h 0.44 (high)
  • Brand mark near hemSmall stylized brand mark reading 'on' in lowercase, positioned near the lower left front hem and contrasting in a light color.
    1 regionx 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 regionsx 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
Core 3" short product image 3
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 regionx 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 regionx 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 regionx 0.64 · y 0.36 · w 0.22 · h 0.12 (high)
  • Right rear pocket textSWISS ENGINEEREDPartial
    1 regionx 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 regionx 0.04 · y 0.79 · w 0.16 · h 0.15 (high)
  • Front-facing left logoSmall white stylized two-letter logo near the lower left front-facing hem.
    1 regionx 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 regionx 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 regionx 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 regionx 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 regionx 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

Provenance

Merchant Link
https://www.simons.ca/en/women-sportswear/pants-shorts/sports-shorts/core-3-short--17575-25002?colourId=0
Updated