The SHS 8100 there are 3 different sizes of rubber gauntlets to depending on the ear canal size.
This model not only sits well and has a better sound than the above-mentioned model, I have yet to ever more no problems with moisture in the ears. Even the cable is long enough to make it to lead the pocket under the shirt up in eg.
Each is looking good affordable in-ear headphones for sports, I can recommend this model unreservedly.