It can be a complex process year to year trying to figure out if it's time for long tights, fleece lined tights or three quarters. Leg and knee warmers provide you with the options during that seasonal transition between shorts and tights. Even during the 'shorts season' there may still a summer week or two that can be made more bearable with the addition of leg and knee warmers.
How and when they're worn or with what, is entirely the wearer's decision and you have a choice between full length leg warmers, three quarters or knee warmers. If you have a preferred pair of bibs or shorts but they don't quite keep you protected against the elements, a pair of warmers should come in very handy.
Within the leg/knee warmer range you will find products that are either made with Softshell or a thermal material. Softshell is highly breathable whilst offering insulation for activities in varying weather conditions. These warmers would be perfect for autumn or cooler spring and summer rides when rain threatens. Thermal products may be fleece lined or not, may have water and windproof properties and many brands include various styles of Thermal barriers within the fabric. These may include Gortex, Thermoflex, Thermolite etc. Each will differ in degrees of thickness and insulation and what suits one won't necessarily suit another, so when possible be sure to try a selection before deciding and consider what kind of riding they are intended for.