Formfitting with a zippered closure to keep cooling effect close to the bodyOversized armholes allow full range of motionLightweight spandex back panel rated to UPF 50+Wicking outer layer reflects heat and facilitates evaporationAbsorbent middle layer stores water for evaporationMesh lining keeps dog dry and comfortableSize guideXXSmall 13-17 in (33-43cm)XSmall 17-22 in (43-56cm)Small 22-27 in (56-69cm)Medium 27-32 in (69-81cm)Large 32-36 in (81-91cm)XLarge 36-42 in (91-107cm)