Blood flow restriction (BFR) or occlusion bands

Blood Flow Restriction: These bands are specifically designed to reduce oxygen supply to the muscles during exercise, which can pre-fatigue slow-twitch muscle fibers and stimulate fast-twitch muscle fibers for faster lean muscle growth. 

Adjustable and Secure Fit: They typically feature adjustable buckles or strong hook-and-loop fastenings combined with a tightly-woven slider to ensure a secure and comfortable fit during workouts, preventing slipping or loosening. 

Durable Material: Constructed from high-quality elastic materials like nylon yarn and latex, these bands offer durability and elasticity to withstand intense training sessions. 

Comfort-Focused Design: Many designs incorporate interior comfort liners and soft edges to minimize chafing and discomfort during prolonged use.