Great selection of neoprene hoods for cold-water and warm-water scuba diving and snorkeling. Thick 7mm hoods are required for cold-water diving. Thinner, tropical hoods are sufficient for warm-water diving and snorkeling. Hoods with a bib have a piece of neoprene that extends beyond the chin and lays on the shoulders, great for tucking inside a wetsuit to prevent water flow into the wetsuit. A bibless hood ends just below the chin and sits above the shoulders, perfect for use with a drysuit as it can't be tucked inside the neck seal so will sit nicer against the neck.