The Cressi Soft Boots are single-lined, thin, high stretch neoprene
2.5mm Neoprene
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
The sox make it a lot easier to put on your wetsuit and increase warmth