Burton Women's Performance Lightweight Socks, Dress Blue, Small/Medium Burton Women's Performance Lightweight Socks in Dress Blue. Size S/M. New in original retail packaging with tags. Model: W PRFRMNC LTW SCK. Item #: 21219103401. 47% Polyamide, 18% Merino Wool, 18% Acrylic, 12% Polypropylene, 5% Elastane. Compression technology and moisture-wicking construction. Burton is a Certified B Corporation.