C4 technology provides advanced comfort and support for long shifts
Contoured graduated compression prevents swelling and offers targeted support
Extra padding in heel, ball of foot, and ankle reduces impact and friction
Cutech copper-infused fiber enhances circulation and reduces bacteria
Silver Tech antimicrobial treatment fights foot odor and infection
Summarized by Shop
🏃 The Original. The Everyday Essential. The Performance Crew is the sock that started it all. Mid-calf height, premium construction, and FirstOn's signature C4 Technology — this is the go-to sock for first responders, athletes, and anyone who spends long hours on their feet and refuses to compromise on comfort. 100% Made in the USA with 10