Engineered with anatomical design and Targeted Compression, providing a Custom-Like Fit and reduced risk of blisters, plus Ultra Light cushioning takes up minimal room inside the shoe. Targeted Compression and anatomical design provide an unmatched Custom-Like Fit. Our thinnest cushion option provides a lighter, cooler feel. Anatomical design enhances fit, delivering maximum comfort and protection by eliminating blisters. The Perfect ToeA(R). (No irritating toe seam.) 5" cuff is perfect for trail running or cycling 92% Nylon 8% Spandex. Machine wash cold. Hang to dry. No bleach or fabric softeners. For best results, wash socks inside out.