Viper 5mm split toe boot guls latest boot evolution new for spring summer 2016 the viper boot features our exclusive boltdry quick dry thermal lining as well as some additional brand new features brand new features include rs flex 150 textured stretch neoprene 20 lighter 30 less water absorption razorsole razor cut channels increase grip and stability of the sole giving your feet maximum freedom g tape fused seams offer additional reinforcement creating a