The Apple Watch Sport Loop band was woven from nylon thread to create a hook-and-loop closure. These bands were available for the 41mm and 45mm Apple Watch models, and were offered in sizes to fit 130–200 mm wrists (41mm) and 145–220 mm wrists (45mm).
This Elderberry band used a multi-stripe design. The primary color of the background was dark purple (the color of the elderberry), and 8 thin rows of contrasting colors accented the background, including two rows of melon, 2 rows of light purple, 2 rows of burgundy, and 2 more rows of light purple. The two edges were different colors, one side was melon, and the other side was pale pink. The connector plastics were dark purple (almost black), and the closure plastic was melon.
Apple described the Apple Watch Sport Loop band:
“Soft, breathable, and lightweight, the Sport Loop features a hook-and-loop fastener for quick and easy adjustment. The double-layer nylon weave has dense loops on the skin side that provide soft cushioning while allowing moisture to escape. On the reverse side, the attachment loops are securely anchored for superior durability.”
Sources: Apple, Bandbreite app, Wikipedia