Platypus Lo-Stretch™ is a three-layer co-polymer nylon monofilament that has such low stretch it thinks it’s a braid. The advantage of braid is the incredible sensitivity you get from near zero stretch. Platypus Lo- Stretch™ has the lowest stretch possible fom a monofilament. It gives you the best of both worlds – enough stretch to allow a slight shock absorbing quality with minimum stretch for maximum sensitivity.