Other crampons were not designed to flex and move, Kahtoolas are! Kahtoola's unique extender bar flexes with your footwear which is absolutely critical if you are using your crampons on most styles of footwear from flexible ultralight boots to plastic sheep hunting boots. The other design element is that 3/4" spikes reduce snagging, ankle twisting, and snow packing between spikes and are ideal for slick grass slopes and all types of frozen ground. Kahtoolas are also one of the lightest and most compact crampons you can get. Kahtoola's 10-point gripping system is made from the strongest aluminum alloy and weighs only 18.9 ounces per pair. Straps and quick-release buckles make it easy to put the Kahtoola Traction System on with any boot, regardless of design. These crampons are ideal for hiking, non-technical mountaineering and hunting. These items are a necessity where slick grassy conditions,frozen slopes and glacier travel is expected. -18.9 oz -3 year warranty Sizing: S/M: 4-9 US mens M/L: 9-14 US mens