The cooling sleeve is made of lycra, which are soft and cool to wear in summer. Outstanding comfort, excellent breathability, highly elasticity, superb moisture absorption. UV protection, protect you from the sun in summer. Suitable for golfing, cycling, fishing, driving, jogging, claiming, boating, gardening, basketball, tennis and so on. Great skin protection when you are working outside or doing any outdoor activities. Suitable for Indoor Activities too, even your workplaces. Great gift for your families and friends.