ThunderShirt for Dogs, XX Large, Platinum Sport - Dog Anxiety Relief Calming VestEach style of ThunderShirt is lightweight, machine washable, and breathable, and they all help your dog to feel calmer during fireworks, thunderstorms, travel, vet visits, and more! ThunderShirt is the original, vet recommended calming solution that helps reduce anxiety in dogs in a drug free way. Like swaddling an infant, our dog anxiety vest's patented design applies gentle, constant pressure to calm many types of anxiety and fear issues in dogs.