Ultra-thin and lightweight construction for a feeling of barely presence. The Locked-in Fit construction keeps the sock securely on the heel, so it doesn't need to be adjusted and won't fall off. Strategic mesh panels on the instep ensure breathability. The material wicks away sweat and dries very quickly. Internal non-slip silicone grips on the back of the heel help prevent the socks from slipping. Front comfort flap protects your instep from lace biting and irritation. The anti-odor technology reduces odor in the sock. The seamless toe provides excellent comfort and reduces irritation.