Waterproof B1 Series 6.5mm Semidry Boots Keeping your feet protected from cold is essential for overall warmth, your mother told you so didn’t she? Waterproof keeps Mom and your feet happy by offering a boot range that is built for extreme conditions. This is a tough 6.5mm semi-dry boot with an extra long zipper for easy donning. The heels and toes are strengthened and the boot has an angled design for less stress while finning.