This is the 4mm Argos Neoprene Stealth No Slip Socks with Ultra Stretch Neoprene Features: Abrasion resistant toe guards No-slip polyurethane coating grip Ultra-stretch neoprene panel Elastic and chemical resisted neoprene Engineered for endurance, stability and longevity Constructed of vigorously tested materials Argos wetsuit booties are the pinnacle of spearfishing and free diving booties. Attention to detail and engineered for endurance, stability and longevity. Argos wetsuit booties are constructed of vigorously tested materials that withstand the elements no matter where your adventures take you.