Description of MSR 4" Flotation Tail - Classic & Acsent MSR’s groundbreaking modular design makes our shoes extremely versatile. Simply attach an optional 4- or 8-inch for additional flotation in soft snow or when carrying a heavy pack. This quick adjustment - easy to do in the field - allows one pair of shoes to adapt to a wide range of loads and snow conditions. Compatible with the Denali Classic and Denali Ascent snowshoes. Features: Weight: 11.3oz/322g Size: 8" x 9.5"/20cm x 24cm