Nylon is probably the best material for making long servicing and comfy equipment. It's lightweight, water-proof, as well as resistant to insects, mildew, rot and many chemicals.
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Nylon is presented by highly affordable price and ability to be easily cleaned. Thus it's practicable material as well. For reasonable price you get both comfort and practicability. Leashes made of nylon can be used for walking, training, tracking, pulling, patrolling.
