Waterproof B50 3mm LOW CUT BOOT - SPORT SERIES. Too hot for ankle boots? Try our lightweight Sport Series low cut wet boot in 3mm neoprene. A very comfortable and flexible boot in the expected high WP quality. Glued and blind stitched for strength. Easy to get on and off. Simplified design but the expected high WP quality. Soft 3mm neoprene / Flexible / Robust grip sole.