Size 3XL: chest 70 cm, neck 44 cm, back 55 cm snug cut—measure twice, choose the larger if in doubt, and always trust the chest. The shirt is knit from 95 % soft cotton and 5 % spandex so air can circulate, sweat is pulled away, and every sprint, stretch, or roll stays effortless. Long sleeves guard against thorns, claws, mosquitoes, and post-op stitches, while the elastic hem lets you slide it on in seconds and keeps it in place during zoomies. Lightweight enough for summer yet cozy as a winter base layer, it steadies body temperature, cuts down seasonal shedding, and doubles as calming sleepwear or a lick-deterrent barrier. Whether the day calls for couch cuddles, neighborhood walks, park play, hiking, camping, travel, training drills, or beach runs, this single tee keeps your dog comfortable, protected, and ready for every adventure.