What reversible and closed-end describe
Read how the sleeve is built and what the manual allows you to remove.
Separate texture from construction
Reversible usually describes a design that can present different textures when used as directed. Closed-end describes where the channel stops. A sleeve can have both features. Check the exact manual before turning it inside out or removing it from its holder.
Check cleaning access before choosing
Look for a view of the sleeve out of its case if the listing says it detaches. Ask whether the maker specifies a drying method for a closed end. The manual sleeve cleaning guide explains how to distinguish the sleeve, shell and cap.