DescriptionPuts it into the water, twisting it, then put it into the fridge for a few minutes and take it out. The cooling effect of the scarf will be more obvious. Don't hesitate indulge your furry friends with this cool ice collar. It's durable and will not deform after multiple cleaning.Features-Material: PVA -Size(S): 31.00X8.50X0.10cm/ 12.18X3.34X0.04in (neck circumference:19-31cm/7.48-12.20in)-Size(M):42.00X12.00X0.10cm/ 16.51X4.72X0.04in(neck circumference: 31-42cm/12.20-16.53in)-Size(L):63.00X18.00X0.10cm/ 24.76X7.07X0.04in(neck circumference: 42-57cm/16.53-22.44in)-The material is adopting the advanced cold technology, which mean it can resist heat and cooling. -It dose not contain chemicals, you can use it to cooling your pet with confidence. -Cool fabric can adjust temperature by absorbing heat, and the cool factor brings a cool comfort to pets. -The material is much lighter, breathable and comfortable to wear than ordinary moisture-proof fabric. -If put in water, wring dry, and then put in the freezer for 10 minutes before taking out, cooling effect is more obvious. -Multiple use occasions, you can take your dog out for a walk, exercise, mountain climbing, etc.