DetailsMammoth Lakes 1/4 Zip Size Chart With its sweeping alpine scenery and deep blue lakes, the Mammoth Lakes Basin is a fantastic place for Trail Running. Numerous trailheads weave through the acres and acres of pines trees, jagged mountain peaks and cascading waterfalls, making Mammoth Lakes a true runner's paradise. The Mammoth Lakes Quarter-Zip is designed for intense, cold-weather activities. It's your soft midlayer for snow or cold-weather runs. The quarter-zip design gives you the option of beginning your run with full coverage, while providing extra ventilation when things heat up. It features flatlock seam construction to prevent chafing and a fleece backed, heavily brushed fabric for added softness and warmth. It's cut to fit close enough to the body to be worn alone on chilly days but just loose enough to fit over your CIRQ Lightweight Baselayer when the temperature really drops.