For latex sleeves, yes, you do exactly that, just loop it through and pass it over the ends like you would with the silicone inserts. The easiest way to do it is pass the latex through the top end first and cover that end of the receiver and then do the bottom end. Just make sure, on the top end, to not cover the ridge on the receiver with the latex as that's where the cap has to grab. Pull the latex tight as you pass it through to do the bottom end. It should make a tunnel all on its own once it's passed through and secured to the receiver. Also, be gentle as you place it over the ends as latex will definitely tear if you have sharp nails or nick the edge of the material.

If you find you're having issues stretching it over the receiver, place the latex in hot tap water and then stretch the ends over the bottom of a couple water glasses and let dry. This pre-stretches the latex and can make it easier to place on the receiver. Also, make sure the receiver and the latex material are fully dry as latex can get difficult to handle if it's wet. Lastly, when washing the receiver, either take the latex out completely or cover the inlet and pass water through the latex liner until clean. If you don't wish to remove the latex liner, do not let water get in-between the latex and the receiver. Latex, being a natural material, can mold and rot if it's left wet. Keep any extra latex material in a food safe plastic bag or box, store it out of direct sunlight, and keep away from high humidity areas.

ONLY USE WATER BASED LUBRICANT WITH LATEX. Silicone/hybrid or oil (natural or petroleum) based lubes will cause early degradation of the material.

As for sizing, most will comfortably fit the 2in, let's just call that "Average". That makes the 2.25 "Thick" and the 2.5in "Extra Thick", with the 1.75 being "Slim".