These are the Cressi Anti-Slip 2.5mm Easy to put on Neoprene High Stretch Scuba Diving Boots Features: These are single-lined, thin, high stretch neoprene boots The inner is lined in Metallite so they are easy to put on The sole has an effective non-slip lining They can be used with both closed foot fins for greater warmth and to protect the skin from scratches and chafing, as well as with firm-soled boots, using open-heel fins Warmth is considerably increased and it is also easier to put on your wetsuit These extremely versatile booties are a must-have as they can be used alone or layered for added warmth.