100% Polyester.  Jacket has snaps and velcro.

Size Chart: XXS= 6-8"(length)/8-10"(girth) XS= 8-10"(length)/12-14"(girth) S= 12-14"(length)/16-18"(girth) M= 16-18"(length)/20-22"(girth) L= 20-24"(length)/24-28"(girth) XL= 26-30"(length)/30-34"(girth)