Make sure that even your youngest kids are with the program and get them stoked about riding while keeping them out of hospital! the poylmer grom knee is based on the salvo polymer knee design and rocks an industry-standard sas-tec protector.Features:- Kevlar Stretch: Kevlar Stretch is an extremely durable, lightweight, flexible fabric with amazingly high abrasion resistance.- Neoprene: Neoprene is a foamed material made from synthetic rubber. It has excellent thermal insulating properties and is flexible over a massive temperature range.- Power-Webbing: Power-Webbing is high-quality knitted webbing that gives you flawless performance and functionality in extreme conditions. It meets the highest standards of durability and strength.- Respiration Mesh: Respiration Mesh is the standard jersey mesh material for our protection jackets. It’s a super-lightweight, ultra-breathable, 4-way stretch fabric for awesome comfort.- Non-Stick Hook-and-Loop Fastener: Non-Stick Hook-and-Loop Fastener is specially designed so that it only sticks to what it’s meant to. It doesn’t get caught on clothing and avoids damage to fabric caused by tearing out fibers.Specifications: - Weight: 200g- Primary Material: 40% Chloroprene Rubber, 20% Polyurethane, 20% Polyester, 15% Nylon, 5% ElasthaneTechnology:- Sas-tec: created in germany, sas-tec makes industry-standard, built-to-last soft-foam & epp protection. the protectors are lightweight, ventilated, ergonomically designed and washable. effective against all kinds of impacts, they can also withstand multiple hits.- Articulating design: our articulating design concept is inspired by nature to give you total freedom of movement without compromising your safety and comfort.- 3D panels: 3d panels are thermoformed from eva and elastane. they are lightweight and comfortable on long hikes or super-steep runs in any weather.