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MSR's Lightning Ascent snow shoes are built on the outdoor outfitter's advanced 360-degree Traction frames and Torsion2 crampons. Dual-component PosiLock AT bindings offer secure attachment, while aggressive steel cross members and easily-engaged Ergo Televators back you up with every step. The shoes fit men's shoe sizes 4.5 to 15 and have an eight-inch width, and come with the all-condition adaptability of MSR's Modular Flotation tails. Two-piece, independently conforming PosiLock AT bindings create a comfortable, secure fit. Features Traction: 360-degreeTraction frames with edge-to-edge grip, and split teeth of Torsion2 crampons distribute forces and offer continuous contact on any terrain, in any conditions Secure Attachment: Two-piece, independently conforming PosiLock AT bindings create secure, freeze-resistant attachment, regardless of footwear All-condition Adaptability: Add-on Modular Flotation tails to allow the maneuverability of a smaller, primary snowshoe with on-demand flotation of optional five-inch tails Uphill Efficiency: Ergo Televators reduce fatigue and increase traction on the steeps, with an ergonomic design that engages with simple flick of a pole grip Specifications 22-inch length: Three-pound, 13-ounce weight 180-pound weight capacity 250-pound weight capacity with tails 25-inch length: Three-pound, 15-ounce weight 220-pound weight capacity 280-pound weight capacity with tails 30-inch length: Four-pound, seven-ounce weight 280-pound weight capacity 300-pound weight capacity with tails Lifetime Warranty MSR products are made in Seattle, Washington, and include a limited lifetime manufacturer's warranty against defects in materials and workmanship. About MSR MSR is part of a company named Cascade Designs, started by three friends and former Boeing engineers -- Jim Lea, Neil Anderson, and John Burroughs -- who were laid off from the aeronautics giant in 1971. Outdoor enthusiasts looking for the next great gear idea, they went on to design the world's first self-inflating mattress, the Therm-A-Rest. Today, Cascade Designs remains a private, family-owned company that has grown to be one of the most respected outdoor manufacturers in the world.