Very happy with this for my airpods max. Me gusto mucho el producto! The 4x size is true fit/true to size and is stretchy enough to accomodate two sizes larger easily. The sound quality is amazing, the design is sleek and modern, and the fully customizable RGB lights are so freaking awesome! I have a hard time finding cute little sandals for her. However, she hates heavy soled shoes and these are nice and light. One of the ropes arrived defective. I need a 13 in the Duet Sport. These are going in the garbage--I would rather use the google USB-C earbuds which dont have the silicone tips to seal the ear canal. Just starting to show their wear so bought 2 more pairs.