Jump 99 Strength Plyometric Training Shoes INCREASE VERTICAL JUMP  With our Jump 99 training shoes you can increase your vertical jump by 5-10 inches. Focus on jumping higher, running faster and being more powerful. INCREASE FAST TWITCH MUSCLE  working out properly with our jump 99 plyometric training shoes allows you to increase the fast twitch muscle we use for powerful burst of movements like jumping or sprinting. INCREASE YOUR SPEED  Increasing the strength of your fast twitch muscles allows you to lower your 50M dash time by 2/10th of a second. INCREASE CALF MASS AND DEFINITION  Jump 99 training shoes will define you calf muscles and increase the reactive strength / agility COMES IN A VARIETY OF SIZES - We have a number of different sizes 5  13 for children and adult. At first the shoes will feel funny, but in seconds you will feel your calves working out the fast twitch muscle. Collect the jump 99 shoes and add them to you Nike or adidas collection. Shoes fit to size but if there is ever an issue with your size please message us and we will get you in the correct size.