This ski/snowboard boot bags are made of superior quality 1680D polyester. It is the popular and ideal lightweight material for ultra-strong and heavy duty bags. Double PU coated and polyester material are water-proof, stretching resistant, wear-resistant, durable for any weather conditions. Anti-slip PVC helps preventing slippery. The bag provides ventilated holes in side-entry boot pockets circulating air preventing smell, dry the boots without getting molded. Sternum strap make the backpack more comfortable.