The Scuba Pro Delta Boots are a Versatile Non-Marking Rubber Sole Easy-to-Wear Zippered Boot in 5 mm Thickness, for Temperate and Cold Water Diving. Boot is made from 5 mm Nylon ll Neoprene which will keep your feet Toasty Warm. The Delta Boot has Glued-and-Sewn Seams for Strength and Durability with Elastic Taped Sewn Top for additional Strength. The Durable Zipper Closure with Internal Gusset keeps Water Exchange to a Minimum and provides Ease of Donning. The Boots are equipped with a Heel and Toe Cap for Strength and Durability and a Heel Fin Strap Retainer which will prevent Fin Strap Slippage at Depth. Boots are Black in color and are covered by a 12 month limited warranty.