MSR Evo Tail Black. Simply slide them on and twist down the adjustment knob for added flotation in deep snow or when carrying a heavier pack. Specifications for MSR Evo Tail: Manufacturer: MSR Weight: 12.2 oz Features of MSR Evo Tail Unrivaled Versatility: On-demand flotation allows you to select a smaller primary shoe for added agility in packed conditions. Packable: Light and low-profile for easy packing on any trip. Easy: Simple attachment system lets you attach and remove tails without removing shoes. Evo tails not compatible with Denali snowshoes. Package Contents: MSR Evo Tail MSR 5650: Evo Tail Black