Extremely lightweight while offering a groundbreaking level of comfort and convenience. In other words, the ultimate wader. Patagonia started by strategically placing varying weights of proprietary waterproof/breathable polyester microfiber fabric package with H2No® Hydrostorm barrier according to specific breathablility or toughness needs. The result? Max durability and flexibility without resorting to excessive heavy, sweat-trapping multiple layers. The revolutionary new merino wool grid-lined neoprene booties wick perspiration and create guilt-inducing levels of foot comfort. The most advanced version of our innovative internal suspension system allows easy conversion to waist height and this is critical quick relief without having to remove your jacket or fight sticky zippers. More features: sculpted upper for reduced drag in heavy currents, anatomically designed left and right legs and booties, built in fabric gravel guards with abrasion-resistant scuff zones and high-filtration mesh drain strip. Field repair kit included.