Great, form fitting pull-on Booties available in three thicknesses so you can choose the one that enhances your specific shoe/boot fit. Ankle Booties allow your foot to grip your footwear better, yet offer protection from rubbing and blistering. These have been described to us a cross between sockless and wearing socks... so the best of both worlds! Features flatlock stitching for durability and stretch. We recommend the Ultrathin for custom or tight fitting boots.The 2mm gives light cushion and fills in small gaps. The 3mm fills in gaps in loose boots and reduces rubs and pressure from recreational boots. Great also for running, cycling, skiing, hiking, rock climbing, equestrian sports, snowboarding, backpacking, racquet sports, soccer or any active sport!