Description: 【Adjustable strap】: The Baseball Training Sock features an sticky strap that securely fits most arm sizes, 49cmx16cm/19.29inchx6.30inch in size 【Enhance Throwing Mechanics and Speed】: Designed to promote proper throwing mechanics during warm ups and practice, this Baseball Throw Training Sock provides instant feedback after each throw, helping you improve your speed with usage 【Easy to put】: Great for individual training, this Softball Pitching Trainer is Easy and quick to put on or take off, convenient to carry 【Effective Warm Up Tool】:Baseball Pitching Training Sleeve Used to simulate pitcher training movements and help players practice pitching skills 【Portable】: This baseball training tool is easy to carry around and suitable for both adults and teenagers, making it an ideal choice for practice Size Chart: 49cmx16cm/19.29inchx6.30inch Package Includes: 1 Baseball Throw Training Sock