The Spring Fall RX Leg Warmers P1 use a soft, brushed textile that rates equally high for insulation and breathability, a balance most leg warmers don't strike. That combination targets the 54 to 68 degree window where bare legs get cold at the start but a full tight would trap too much heat once the effort builds. A regular fit keeps the warmers snug enough to stay put without pinching under a bib short. What Our Gearhead(R) Experts Are Saying:"I've started rides in the low fifties in these and never had to unzip a jacket or peel a layer once I hit the first climb, since the fabric sheds heat as fast as it holds it. That balance is what makes leg warmers worth packing instead of committing to full tights."