Not C4. Our collars are stink proof, too.
They stink, look dirty and cause skin irritations.Most Collars stay wet and are like sponges for dirt, grime, and bacteria. Flora Dog Collar With Silver Buckle - Large C4 Collars are ultra-durable and mega-comfortable. Made of medical grade thermo-elastomer, C4 collars are non-porous which makes them waterproof, stain resistant, hypoallergenic, and easily washable.