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Smartwool to Spanx leggings size

The short answer

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

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 Spanx. Letter sizes on the left, Letter on the right.
SmartwoolSmartwool builds it forSpanx, by chartSame labelSpanx builds it forSpanx also prints
Swaist 29 to 31 in, hip 36 to 38 inMSwaist 29 to 31 in, hip 38 to 40 inUS numeric 8-10
Mwaist 32 to 34 in, hip 39 to 41 inLMwaist 31 to 33.5 in, hip 40 to 42.5 inUS numeric 12-14
Lwaist 35 to 37 in, hip 42 to 44 inXLLwaist 33.5 to 36 in, hip 42.5 to 45 inUS numeric 16
XLwaist 38 to 40 in, hip 45 to 48 in1XXLwaist 36 to 39 in, hip 45 to 48 inUS numeric 18-20
XXLwaist 41 to 44 in, hip 49 to 51 in3Xnot publishedwaist 42 to 45 in, hip 51 to 54 inUS numeric 26
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

Spanx to Smartwool