FAQ

  1. Home
  2. FAQ
FANNIFEN Size & Fit FAQ
Please refer to our detailed size charts. For men’s boxers, size A measures the waist width (in cm) and B measures the length from waistband to leg opening. We offer a full range from 140/146 (28 cm waist) to 3XL/4XL (38 cm waist) for regular fit, and from M (34 cm waist) to 5XL (47 cm waist) for extended sizes. If you’re between two sizes, we recommend choosing the larger size for a more relaxed fit.
The first chart covers youth and standard adult sizes, while the second focuses on extended men’s sizes (M–5XL). This ensures a comfortable fit for every body type — from teens to plus-size men — without compromising on stretch or support.
A (Waist Width): Measure around your waist where you normally wear your underwear. B (Length): Measure from the top of the waistband down to the leg opening. For the best accuracy, measure over a thin layer of clothing and ensure the tape lies flat against your skin.
We understand that sizing can vary slightly based on body shape. FANNIFEN offers a fit guarantee — if your first pair doesn’t fit, contact our support team and we’ll help you exchange for a better size (unworn, unwashed items only).
Yes. Our products are made using European sizing standards and high-stretch fabrics for consistent comfort. Each piece undergoes multiple fit tests across different body types to ensure that your chosen size fits as expected.
To maintain softness and elasticity: Machine wash cold (30°C) Avoid bleach or fabric softeners Tumble dry low or air dry Do not iron or dry clean Proper care helps extend the life and shape of your underwear and socks.
Yes. FANNIFEN also designs women’s underwear and socks made from breathable, moisture-wicking fabrics with seamless designs — combining comfort, functionality, and European elegance.