national geographic fitted low cut 2 mm fin socks, booties for snorkeling, scuba, or swim national geographic fitted neo sock - an amazingly comfortable and practical solution to improved performance and comfort from your fins. the plush neoprene inner sole and carefully placed seams make for optimal comfort and the non skid pattern on the sole make for improved footing. the heavy duty mesh scuppers allow ease of draining. the neoprene uppers makes for non chaffing and an easy fin fit,accommodating from a size 5 through 12.**** available in 7 sizes xxs-(516) xs- (6/7) sm-(7/8) md-(8/9) lg- (10/11) xl-(11/12) xxl(12/13)