Stay warm without losing the feel of the board underneath your feet in the ultra warm Patagonia R4 Split-Toe Boots. The 3 and 5 mm neoprene is lined with a hydrophobic, low-pile micro-grid polyester, and the fine-grip rubber offers unmatched dexterity and protection. When the water turns hypothermic, drop into the R4® boot and paddle out. Waves wait for no man.