Smartwool to Year of Ours leggings size

The short answer

Smartwool S is Year of Ours Medium by the two brands' own charts. 5 of 5 Smartwool sizes land on a different label at Year of Ours.

Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.

Every Smartwool size read across to Year of Ours. Letter sizes on the left, Letter on the right.
Smartwool	Smartwool builds it for	Year of Ours, by chart	Same label	Year of Ours builds it for	Year of Ours also prints
S	waist 29 to 31 in, hip 36 to 38 in	Medium	Small	waist 29 to 32 in, hip 41 to 43 in	US numeric 6-8
M	waist 32 to 34 in, hip 39 to 41 in	Large	Medium	waist 33 to 35 in, hip 44 to 46 in	US numeric 10-12
L	waist 35 to 37 in, hip 42 to 44 in	Extra Large	Large	waist 36 to 38 in, hip 47 to 49 in	US numeric 14-16
XL	waist 38 to 40 in, hip 45 to 48 in	2X	not published	waist 39 to 41 in, hip 50 to 52 in	US numeric 18-20
XXL	waist 41 to 44 in, hip 49 to 51 in	2X	not published	waist 39 to 41 in, hip 50 to 52 in	US numeric 18-20

Tinted rows change label or sit between two sizes. Read from the two charts only; no formula and no averaging.

What wearers say

Charts describe a garment. People who own both brands describe a fit, and their answer ranks above this table once five of them stand behind it. Pick your size in the converter to see whether there are enough yet.

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Sources

Smartwool size guide, read on 2026-09-18.
Year of Ours size guide, read on 2026-09-18.

Year of Ours to Smartwool