The Patagonia R5 Yulex 7mm Round Toe Boot is probably one of the warmest booties in the market. These wetsuit boots were designed for the extreme cold when dexterity is essential in frigid conditions. The lining inside is especially warm, made of a thermal microgrid so your feet stay toasty and the thoughtful design includes a watertight seam construction with a microgasket at the heel to prevent water entry. Made of natural rubber and sustainably made, these round toe boots are about to be your new favorite surf accessory.