Blu Size Guide

Find your perfect fit with our underwear size guide. Measurements are provided in both centimeters and inches.

BLU Size Waist Fit (cm / in) Hip Fit (cm / in)
XS 64–68 cm / 25–26.5β€³ 88–92 cm / 34.5–36β€³
S 69–73 cm / 27–28.5β€³ 93–97 cm / 36.5–38β€³
M 74–78 cm / 29–30.5β€³ 98–102 cm / 38.5–40β€³
L 79–83 cm / 31–32.5β€³ 103–107 cm / 40.5–42β€³
XL 84–88 cm / 33–34.5β€³ 108–112 cm / 42.5–44β€³
XXL 89–93 cm / 35–36.5" 113–118 cm / 44.5–46"

If you usually wear classic men’s boxers, start with the waist number on the label.

– Classic Men’s S β‰ˆ blu S (or M if you’ve got more curves)

– Classic Men’s M β‰ˆ blu M/L

– Classic Men’s L β‰ˆ blu L/XL

– Classic Men’s XL β‰ˆ blu XLΒ 

We are developing more sizes since we want to become size inclusive. Please mind that as a small business starting out order quantities are limited. We will size up and down as fast as we can. If you have a specific request, please message us, we truly want everyone to be able to wear our product.


How to Measure
  • Waist: Measure around your natural waistline, where your body curves in. Keep the tape measure snug but not tight.
  • Hips: Measure around the fullest part of your hips, typically about 3-5 cm below your waistline. Keep the tape measure parallel to the floor.
Fit Tips
  • If you're between sizes, choose the larger size for comfort
  • Our blu underwear is designed to move with you throughout the day
  • For any sizing questions, please contact our customer service team

All measurements are taken while wearing minimal clothing for the most accurate fit.