I've gotten a lot of compliments on these leashes, including from our trainer who only uses the best quality products. I use the 6 foot, 5/8" biothane leash with a very strong, energetic 65 lb retriever that loves water, dirt, and mud. Just wipe it clean. You can even take it into the shower with the dog (using a biothane collar) for an all-in-one bathing experience. The leash offers plenty of grip even when wet. No rope burns. It works well with the prong collar too. I also like that the biothane is stitched rather than riveted so its full width and strength are maintained. For training class where we're doing a lot of leash manipulation, I still use the Soft Premium Leather Leash because it is a bit more flexible, predictable, and less springy than the biothane when trying to collect the leash in one hand. The bright colors are great especially with multiple dogs who have different sized collars and harnesses. Thank you, DogSport, for great products.