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Direct-attach polyurethane outsole is durable
breathable full grain leathers and state-of-the-art thermoplastic urethanes
Designed around a contoured footbed
A removable
Soft cushioning
OS1st TA4 Thin Air in Purple, White & Black Fall 2025 Direct-attach polyurethane outsole is durableOS1st TA4 Thin AirTM Performance Socks feature never before applied technology to keep your feet cool and protected during any activity. Created using 200n medical grade machinery and materials we are able to build in comfort, durability and blister protection, yet with the thinnest upper foot profile ever made. The "Thin SkinTM" construction with uniquely positioned lift bars, maximizes air flow achieving a cooling sensation to your feet. Targeted