Our watch band length fits wrists from 6″ to 9″ in circumference, which covers most of the population. To select width, measure width of watch lug or width of current band at connection point and then select width closest to measurement ( 18mm, 20mm, 22mm, 24mm ). Watch geometry will also impact fit.
https://www.amazon.com/Ritche-Strap-Black-Heavy-Buckle/dp/B0778LQ6JB

