Description: 【Adjustable Fit for Comfort】: The training tool features an adjustable strap that securely fits most arm sizes, ensuring comfort throughout your practice sessions. Size: 49 cmx16 cm/19.29 inchx6.30 inch 【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 correct usage 【Solo Training Convenience】: Great for individual training, this Softball Training Sock allows players to practice without a partner. Each ball is securely held in the sock, eliminating the need to retrieve after every throw 【Effective Warm Up Tool】: By encouraging proper pitching techniques, this Baseball Pitching Training Sleeve aids players in independently refining their skills. It offers immediate feedback post throw for continuous improvement 【Portable and Lightweight Design】: Compact and foldable, this baseball training tool is easy to carry around and suitable for both adults and teenagers, making it an ideal choice for practice Specification: Material: Cotton Cloth Size Chart: 49cmx16cm/19.29inchx6.30inch Package Includes: 1 Baseball Throw Training Sock Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.