The Supreme 3mm Split Toe boots are our warmest boots to date. The Supreme 3mm Split Toe boots are our warmest boots to date. The Supreme 3mm Split Toe boots are our warmest boots to date. Redesigned and streamlined with minimal GBS Liquid seams to make sure cold water stays out. The Supreme boots are crafted from MX2 Foam and Wind Mesh neoprene with Hex-grip lite at the sole, for optimized grip while remaining lightweight. Staying warm has never been easier.