Lululemon to Gymshark size
The short answer
lululemon S is Gymshark XS by the two brands' own charts. 5 of 7 lululemon sizes land on a different label at Gymshark.
Both brands publish the body chest each size is cut for, so every row matches a chest, not a letter.
| lululemon | lululemon builds it for | Gymshark, by chart | Same label | Gymshark builds it for | Gymshark also prints |
|---|---|---|---|---|---|
| XS | chest 35 to 36 in | XS | XS | chest 37 in, waist 29.5 in | not published |
| S | chest 37 to 38 in | XS | S | chest 37 in, waist 29.5 in | not published |
| M | chest 39 to 40 in | S | M | chest 39 in, waist 31.5 in | not published |
| L | chest 41 to 42 in | M | L | chest 41 in, waist 33.5 in | not published |
| XL | chest 43 to 45 in | L or XL | XL | chest 43 in, waist 35.5 in | not published |
| XXL | chest 46 to 48 in | XXL | XXL | chest 47 in, waist 39.5 in | not published |
| 3XL | chest 50 to 52 in | XXXL | XXXL | chest 49 in, waist 41.5 in | not published |
| 4XL | chest 53 to 55 in | not made | not published | not published | not published |
| 5XL | chest 56 to 58 in | not made | not published | not published | not published |
What wearers say
Charts describe a garment, not a fit. We do not collect fit reports for this category yet, so this table is the two brands' own claims and nothing more.
Sources
- lululemon size guide, read on 2026-09-18. lululemon on TrueToSize
- Gymshark size guide, read on 2026-09-18. Gymshark on TrueToSize