our Backpack is ultralight

"Cushion" zones on the heels and toes to protect these areas from greater friction

Elastic fabric and stitching that adapts to all body types

Maximum ventilation: The design allows for complete ventilation around the head to prevent heat retention

thus preventing muscle and tendon injuries

Calcetines UltraLight - Black & Silver Grey jammer our Backpack is ultralightLighter. The Ultralight Socks from OTSO have been designed to offer the greatest lightness, breathability, and elasticity on the market. 3 essential features to ensure comfort and performance during your training sessions and competitions. Fresh and dry pies. High temperature and humidity resistant. Prevents overheating and provides air renewal and freshness so you finish your workouts with dry feet. Perfect fit. Very elastic and seamless ergonomic