Features of the Dog Insect Shield Neckwear Soft polyester microfiber Performance fabric Built-in Insect Shield? Protection? repels mosquitos, ticks, flies and fleas Multifunctional -- can be worn as a gentle collar, sweater, hood, etc 100% seamless construction Moisture-wicking, quick-drying, breathable Lightweight thermal protection Dog appArel and harnesses should not be worn by puppies less than 7 weeks old S/M - 25lbs-40lbs M/L - 40+lbs