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. In this case, warmth is considerably increased and it is also easier to put on your wetsuit. Designed by Cressi, Italian company which has more than Seventy years of experience.