DeFeet Slipstream Bootie Shoe Coverc Neon Yellow LXL MFPN=SPC1-31.8-09 you can use an optical

you can use an optical adapter that you can have adjusted to fit your eyeglasses prescription (can be purchased separately)

BNS uses it as a cover wax to speed up most blue and green kick waxes

From MY2015

5mm 12/13-Speed 8-Bolt Direct Mount DUB Spindle Carbon E1

DeFeet Slipstream Bootie Shoe Coverc Neon Yellow LXL MFPN=SPC1-31.8-09 you can use an opticalThe Slipstream was developed for two purposes: warmth and aerodynamics Slip them on to stay warm and go faster 60% Cordura, 30% Nylon, 10% Lycra Made in USA TECH SPECS Fabric Technology 60% Cordura 30%Nylon 10%Lycra Core No Misc For warmth and aerodynamics Size LXL Primary Color Neon Yellow Color Neon Yellow