Description of Scarpa SL M3 Backpacking Boots If you didn't think the Scarpa SL M3 could get much better, well think again. Scarpa has taken an incredible backpacking shoe and one upped it. The SL M3 provides the comfort and durability of silicone-impregnated full-grain leather, articulated cuff and is even lighter than before. You could choose another boot for intense backpacking, but we wouldn't recommend it. The SL M3 is Scarpa's premier backpacking boot. Features: Improved! leather lined tongue and cuff for comfort Silicone-impregnated full-grain leather, baby Articulated cuff Legendary performance Littleway stitch, example of SCARPA craftsmanship 10% lighter and more comfortable Improved M3 sole for added durability Upper: Sherpa HS12 leather Lining: Cambrelle® Midsole: Performance-flex Sole: Vibram®