Surfing, windsurfing and kitesurfing booties. Lime stone based neoprene, 6.5 mm thick, blind stitch, interior in "PLUSH TITANIUM". (Titanium glue forms a metallic film, that reflects heat). Ultra-thin latex sole 100% natural, very good grip. Velcro around leg. It is very comfortable and very warm! Like all ATAN booties, it is ultra soft: Incredible barefoot sensation: BAREFOOT SYSTEM