Synergy Hand Paddles for Swim Training SUITABLE FOR ALL LEVELS - Comes in 3 sizes: Small, Medium and Large. PROVEN TECHNOLOGY EQUALS SUPERIOR PERFORMANCE - Broad-blade design for optimal water contact and building upper body strength. EXCEPTIONAL FUNCTIONALITY - Holes allow water to channel through the paddles so the fluidity of each stroke is unimpeded. CUSTOM-FIT - Wide-area wrist and finger straps are adjustable for a secure fit. CUSTOMER SATISFACTION - 30-Day Guarantee: If you are not 100% satisfied within 30-days, send it back for a full refund.