Core Pilates Socks and Pointe Ballerina Grip Socks (both colourways) have non-slip grippers built in, designed specifically for reformer and mat work. The rest of the range, Ultra Rib, Raise Rib Crew, Base Cotton Rib, Active Crew and Lite Sports Socks, don't have grippers; they're comfortable, breathable socks for everyday wear, the gym, and travelling to and from a session.