This lens pouches are made of neoprene, the same material used to protect scuba divers from tharsh sea 3mm/0.11in thick (roughly) Neoprene - provides great protection and shock absorption for your lenses. 

Specifications: 

Model : Neoprene Lens Pouch / Case (S M L XL) 

Material: Water-resistant neoprene 

Diameter x height 

S(80*100mm/3.14*3.93in) 

M(95*140mm/3.74*5.51in) 

L(100*180mm/3.93*7.08in) 

XL(100*240mm/3.93*9.44in)