Your products' quality and prices are beyond any compliments that is why I'm going to purchase from you 3 new collars. We have Bulldog, Griffon and Cane Corso and it doesn't matter whether they swim in the sea or hunt together, the collars should be machine washed because they become matted. The collars stand everything. Corso is 60 kg in weight. Every collar fits perfectly. We have nylon ones. Many thanks and till the next time!