BARTON's Elite Nylon Military Style watch straps are custom designed and fabricated from premium seat belt weave waterpoof nylon and 316L surgical grade stainless steel hardware to meet our high standards for fashion, function and fit. The nylon measures 1.4mm thick, making for the perfect combination of durability and comfort. Swap in seconds to compliment your daily wardrobe.</br></br> <b>Selecting Width:</b> </br> Straps are available in 18mm, 20mm, 22mm and 24mm widths. To determine the proper width for your watch, use a metric ruler to measure the ‘lug width’ (the space between the points on the watch head where the band attaches). Lug widths for most common watches are also available by searching online. </br></br> <b>Adjusting Length:</b> </br> All widths (18mm, 20mm, 22mm & 24mm) measure approximately 270mm (10.5 inches) in total length and fit wrists from 5" to 8" in circumference. However, watch size and geometry also impacts fit. If band is longer than desired, fold free end neatly back into the keeper loop or cut to desired length. If trimmed, expose cut end to match or lighter flame to avoid fraying. Full money back guarantee for anyone that does encounter a fit issue. </br></br> <b>Attaching the Band: </b> </br> Refer to diagram in picture above. First, remove original band and reinsert spring bars into watch head (replacement spring bars sold separately on Amazon if needed). Then, simply feed strap between the spring bar and watch casing, behind watch head and up through the other spring bar. Run through stainless steel ring on short strap to secure watch head. No need to remove spring bars (pins) to swap between different colors. </br></br>