Compare openings and internal fit
Check the measurements that describe the inside of a sleeve.
Start with entry and channel measurements
Overall width describes how much space a product takes up. Entry size describes the opening. Check both, and compare measurements in the same units. If no usable fit range is listed, ask the maker before buying.
Check both ends separately
A dual-ended model can have two different openings. Look for measurements and photos for each one. A product described as stretchy still needs to fit comfortably. Follow the maker’s guidance and stop if you feel discomfort.
Match the type of product to what you want
A handheld manual sleeve is designed to be held. If you are looking for a wearable design, use the sleeve dimensions guide for the different measurements used there.