UOG Heavy Duty Memory Foam Insoles –Balance & Posture While You Walk | Pain Relief, Plantar Fasciitis, Boosts Circulation, Prevent Odor | Fits Work Boots, Sneakers, & Casual Shoes. Made in The U.S.A. How does this advanced technology work? Black Diamond Carbon Technology emits beneficial wavelengths that stimulate blood flow and improve circulation. This enhanced circulation delivers oxygen and nutrients more efficiently to muscles, reducing fatigue and aiding faster recovery after physical activities. As a result, you feel more energized, experience less muscle soreness, and enjoy greater overall comfort. Additionally, Black Diamond Carbon adds resilience and durability to the insole material, providing lasting support and superior comfort throughout the day. This makes the insoles ideal for both everyday wear and fitness-focused activities, promoting natural wellness through innovative design.