What Our Gearhead(R) Experts Are Saying: "I've surfed in a lot of booties, and these are some of the best for keeping your feet warm without sacrificing board feel. The split-toe design gives you more control, and the TB4 Firewall lining is crazy warm and comfortable. They're my go-to when the water gets seriously cold." When the swell lines up in frigid conditions, we count on the O'Neill Gripper 3mm ST Booties to keep our feet warm, supported, and locked in. Built for surfers who demand serious performance no matter how low the water temps drop, these booties combine a split-toe design with a connected bridge to enhance balance and control without letting your toes splay apart. Inside, the TB4 Firewall and TechnoButter 4X linings trap warmth and dry quickly between sessions. The strap-free design keeps the fit clean and low-profile, while Krypto Armor and UltraFlex exterior panels stand up to rugged reef and constant wear. With fully taped recycled seams, anatomical shaping, and targeted support from arch to shin, these booties help us stay out longer and surf stronger when the cold hits hardest.