Heat Holders Harry Potter Thermal Socks with Grips Pack of 1 With a Hogwarts logo badge on the cuff and HP lightning bolt anti-slip grip prints on the soles, these mixed colour marl socks are stylish and superbly cosy, featuring the Heat Holders patented long loop pile lining, brushed intensively for softness and thermal performance. The charm is canon; it was used in Harry Potter and the Order of the Phoenix, and Harry Potter and the Half-Blood Prince. There socks are machine washable at 40. They are made from 91% Acrylic 5% Nylon 3% Polyester 1% Elastane Extra Product Details - Standard Toe Seams - Standard Cuffs - Thermal yarn, intensively brushed; Harry Potter anti-slip treads; Hogwarts badge - Thickness: Heavy - 91% Acrylic 5% Nylon 3% Polyester 1% Elastane