Nylon is the strongest synthetic material for commonly used DIY rope. Nylon has significant elasticity and is best used for absorbing shock loads such as experienced when towing. Nylon rope absorbs the shock, stretches, and then returns close to its original length once the load has been removed.  Nylon has good abrasion resistance, does not float, and will absorb water when wet.  When nylon is wet it will shrink slightly and lose 10% to 15% of its strength. Nylon is ideal for use as a tow rope, anchor line, dock line, safety lines, and tie-downs.