Last Updated: 2026

Finding the right size for On Running shoes can be challenging. Swiss engineering often utilizes a "Performance Fit," which can feel narrow, short, or low-volume compared to American brands like Nike or New Balance.

This guide is tailored specifically for the models available right now at TAKOUT NY. Whether you are researching the maximalist Cloudmonster or the lifestyle-focused Cloudtilt, here is exactly how to choose your size.

The Golden Rule for All On Shoes

Ignore your usual US size.

Instead, look at the CM or JP size listed on the tongue of your current favorite sneakers (e.g., Nike or Adidas). This is your baseline.

• Standard Feet: Match that CM size to the On size chart below.
• Wide Feet / High Instep: Add 0.5 cm to your measurement, then find the corresponding On US size.

1. Running & Lifestyle Footwear Sizing

We have categorized our in-stock models based on their specific fit profiles.

Category 1: Runs Small / Narrow (Size Up +0.5 to +1.0)

These models feature a snug, performance-oriented fit. If you have wide feet or a high instep, sizing up is essential.

• Cloud 5 / Cloud 6 (Men's & Women's)
  The Fit: Very snug entry system and a tapered toe box.
  Advice: Size up +0.5 from your standard running shoe size.
• Cloudtilt (Women's)
  The Fit: A sock-like knit upper that naturally pushes the foot forward. It has significantly low volume over the instep (top of the foot).
  Advice: Size up +0.5 for a snug fit. Size up +1.0 if you prefer a relaxed fit or have wide feet to prevent toe pressure.
• Cloudflow 5 (Women's)
  The Fit: A tight, race-day performance fit that is narrow through the midfoot.
  Advice: Size up +0.5 for comfort.

Category 2: The "Tricky" Fit (Cloudmonster Family)

The Cloudmonster features a unique rocker shape (curved sole). Sizing here depends entirely on your foot volume.

• Cloudmonster 1 / Void / Standard (Men's & Women's)
  For Wide/High Volume Feet: True to Size. The roomy toe box works well for you.
  For Narrow/Low Volume Feet: Size UP +0.5.
  Why size up if I have narrow feet? If you have narrow feet, you will not fill the shoe's volume. This causes your foot to slide forward into the hard, upward-curved toe cap while walking. Sizing up gives you the necessary length to sit back in the heel cup.

Category 3: True to Size

These models fit comparable to standard industry sizing.

• The ROGER Spin / Clubhouse Ace: A tennis-inspired silhouette with a standard width. True to Size.
• Cloudrunner 2: Supportive and stable with a standard heel and forefoot width. True to Size.
• Cloudnova 2: Improved fit over the original version. Generally True to Size, but consider sizing up +0.5 if you have a very high instep.

2. Apparel Sizing (Clothing)

On Running apparel features a tailored, athletic cut designed for movement.

• Tops (Hoodies, Tees, Bras): Athletic/Slim fit. If you prefer a relaxed, streetwear look or have broad shoulders, size up one size.
• Bottoms (Joggers, Tights, Shorts): Standard to Slim. True to Size. The waistbands are generally comfortable and stretchy.

3. Kids' Sizing (GS / PS)

Kids' feet grow fast. While On Kids' shoes generally fit True to Size, we recommend sizing up to allow room for growth (approximately a thumb's width at the toe).

Quick Conversion Chart

Men's Footwear

Women's Footwear