Cut
The basic prerequisite for comfortable wear is that the leg warmers fit correctly. They should therefore not have a straight cut, but should be designed to fit the bent leg. You should definitely try on leg warmers before buying them, as the size information only provides a rough guide. Every manufacturer cuts differently, the various models are different - and an ill-fitting leg warmers is quite uncomfortable. If it is too short, your bare leg will show through. If the fabric tube is too long, annoying creases form; if it even extends to the crotch, annoying friction points can occur when pedalling. Even worse are leg warmers that are too tight: even if compression socks are in vogue, a constricting rubber band on the thigh is certainly not conducive to performance. A seam at the back of the knee can be just as annoying. Materials that protect against the cold and wet can impair comfort because they are somewhat stiff. For this reason, only parts of the leg warmers are made of windproof material.
Material
Manufacturers most frequently use brushed polyamide with elastane threads. It is comfortable to wear on the skin and keeps you warm. While the outside is completely smooth, the inside feels like soft fleece. However, it is the same material, only the threads have been brushed on the inside to achieve the desired fluffy effect. Black is the most common and most practical colour variant - but if you are looking for matching leg warmers to go with white cycling shorts, you will rarely find them.
Zips
The leg warmers should be equipped with a zip so that putting them on and taking them off doesn't become an effort. Only then can they be easily pulled over the shoes; otherwise you have to take your shoes off - which is annoying.
Conclusion
The leg warmers are fitted with an elasticated band at the top so that they don't slip even if they are the right size. Perfect: a silicone band on the inner edge adheres well without cutting in.