Indestructawool technology with extended durability zones. 4 Degree elite fit system for a dialed-in, performance-oriented fit. Our thickest and warmest performance sock. Additional body-mapped mesh zones for added breathability. Virtually Seamless toe for enhanced comfort. Get out there with the Mountaineer Max Cushion Tall Crew Socks. Featuring Smartwool most advanced Indestructawool technology for enhanced durability, their 4 Degree elite fit system for an unmatched performance fit, and a Virtually Seamless toe for enhanced comfort. Go far and feel good in these thickest and warmest performance socks.