Smartwool Women's PhD HyFi Vest 100% Wool Women's sizes: X-Small = size 2, 24-25" waist, 32-33" chest. Small = size 4-6, 26-27" waist 34-35" chest. Medium = size 8-10, 28-30" waist 36-38" chest. Large = size 12-14, 31-32" waist 39-40" chest. X-Large = size 16, 33-34" waist 41-42" chest. 64% Merino Wool, 36% Nylon. Washer and dryer friendly! HyFi Double jersey knit, semi-form fit. Center front zipper with semi-locking logo slider, full draft flap and chin guard. Secure zip hand pockets, clean finish binding at armholes.