Swing Sock 13 oz. High Swing Speed Weighted Golf Warm-Up/Trainer Attaches to Club Head (Fits Irons Only) Improves tempo, and timing, while increasing club head speed for greater distance. Can be used any time you feel the need to loosen up. Great in cold weather. Get your muscles warmed up to, make a proper golf swing. In just a few swings your muscles are loose and ready for the first hole. Buckle and Double Velcro flap keeps Swing Sock in place for even the most powerful and fastest swings. Improves strength in the hands, arms, shoulders and back. Increases flexibility and stretches all the important upper body muscles used in the golf swing. Swing Sock fits conveniently in your golf bag. Available in a variety of colors, weights, and sizes.