Amazon, please reach out to this manufacturer and ask them to include an "xs" in their inventory moving forward. Ive used the memory scans from some manufacturers websites and the results say 16 gigs is the limit. FREAKING. Probably better to go with a more secure locking mount for off road trails. Great sound, great range. Warm, well padded and comfortable. Pure junk don’t buy it. This is a great item for my Apple Watch! Terrible connection quality. RGB lighting is great.