O'Neill Wetsuits - O'Neill Psycho 4/3mm Split Toe Wetsuit Boots - Black :: Men > Wetsuits. Deep split toe design for improved balanceAnti-flush shin strapMen's wetsuit bootsMinimal seam design for total comfortUltraFlex Firewall neoprene for warmth and mobilityHeel pull tab for easy-on/offLeash stop toe guardInterior taped seams with external fluid seam weldThickness: 4/3mm Size: UK 5,UK 6,UK 7,UK 8,UK 9,UK 11,one size.