The best of both worlds collide in the Woolverino Micro Weight 1/4 Zip with the ability to zip up when cold and unzip when hot. Still encompassing all of the typical Merino Wool attributes, this top provides unparalleled functionality for any activity. Use it to fend off black flies with the mock neck or as a base layer on your next hike.FabricFiber Content: 84% Merino Wool, 12% Nylon, 4% SpandexKnit: 145 g/m2 Micro Weight Jersey KnitMicrons: 17.5 Micron FibersUPF Rating: 20Total Easy Care: Machine Wash and DryWool Source: AustraliaImported.FeaturesNeckline: 1/4 Zip Mock NeckTagless Label: No Itchy Neck TagsZipper: YKK Semi-Auto Locking Zipper PullZipper Garage: Keeps fabric between the zipper and your skinLight and PackableFlat Lock Seams: Prevents ChafingLayer Type: Base LayerFit Type: Regular - Standard fit with a little bit of room to breathe, but not too baggyModel Features: The model wearing ash grey is 5'10 / 150lbs wearing a mediumRuns True to Size Weight: Size Large = 8.8 oz. (249 grams)Style #: 744UsesIdeal Seasons: Spring, Summer, Fall, WinterActivities: Everyday Wear, Hiking, Camping, Biking, Running, Fishing, Hunting, SnowsportsTemperature Recommendations: 30AdegF and up while active, 60AdegF and up while inactive - Learn More CareWashing and Drying Instructions - Learn MoreTurn Inside OutMachine Wash Cold: Gentle cycle with like colorsDetergent: Mild or wool-specificTumble Dry: Low heatStorage: Place in an airtight container when not in use for long periods of timeDo NOT Use: Fabric softener or bleach!Product StoryWoolverinoWoolverino's Core Spun Technology brings you a merino garment that is durable, athletically fitted and high-performing. Warm when you need it. Cool when you don't. Nylon inner core offers strength, elasticity, resiliency, and durability. Merino Wool outer sheath provides insulation, moisture-wicking, and UV protection.