BUFF Hirajy Blue Polar Multifunctional Neckwear. The most versatile multifunctional polar neckwear for cold weather, made using 97% recycled content and offering high thermal insulation with cozy, lofted fleece. PrimaLoft® Bio™ Fleece is fully biodegradable and is designed to return to nature. Flip it, twist it, fold it. 4-way stretch means you can wear it as a neck warmer, hat, balaclava and more, to keep you warm when the temperature drops.