Both thermal and abrasion protection are offered by your diving boots. 1.5mm is fine for the tropics, 3mm where you need a combination of movement and warmth, 5mm for warmth and 7mm for lots of thermal protection whilst diving.
A great choice for scuba diving in cooler waters, this pair of Seac Pro HD nylon 2 neoprene wetsuit boots have a 6mm thickness and provide excellent protection with their rigidly molded, high-grip sole that's extremely impenetrable. These boots also feature excellent arch support and a heel air bubb..