Silicone band with magnetic buckle. Easy to adjust. Lighweight, super comfortable band, great choice of colours. 
 
*Compatible with all Apple Series. You can match most straps with any Apple Watch Series 3 or newer case of the same size. The 41-mm bands work with 38-mm and 40-mm cases; the 45-mm straps work with 42-mm, 44-mm and 49-mm cases. To find your case size and more information, check the engraving on the back of your Apple Watch.