Whether it is summer or winter, at home or on a journey... the ILS Sunglasses & Goggles of Doggles offer an excellent wearing comfort with a flexible frame. The polycarbonate lenses are impact resistant, anti-fog, replaceable and give your dog 100% UV-protection. Size - Dog's Weight - Distance between eyes XS - 1 - 5 kg - 8,9 cm S - 4 - 12 kg - 12 cm M - 9 - 27 kg - 14 cm