Youth Solids Calf Sock 4-Pack by Bombas. NWT , never warm. This pack of Bombas youth socks comes with four pairs of the most comfortable socks in the history of feet. We use the softest, most durable cotton, hand link the toe seam to get rid of that annoying bump across the top, and add in a growth guarantee for good measure. Calf Socks : 66% Cotton (Supima®) 22% Polyester 8% Nylon 4% Elastane Please note the color slightly varies from first picture