Everyone knows Merino is great at keeping you warm when it’s cold, but did you know our Keystone ‘Summerino' T-shirt is just as effective at keeping you cool and comfortable when it’s warm? The natural breathability and thermo-regulating properties of our MicroMerino® fabrics help keep you insulated against whatever Mother Nature can throw at you. The 96% Merino T-shirt is super fine, soft, lightweight, moisture wicking, odour-resistant, delivers UV protection from the sun and is a revolution in comfort all year round. The Keystone T-shirt can be worn on its own when you’re travelling or adventuring in warm to mild conditions, and is perfect on its own during ‘in between’ weather, whether you’re traveling, riding, running, hiking or enjoying the outdoors. One top. Ready for many adventures. Design with a casual, relaxed fit. Made from ultra-lightweight 170gsm MicroMerino® - 96% superfine Australian Merino, 4% Elastane. SIZE & FIT Designed to have a casual, relaxed fit. True to size. Size Guide. Casual Fit. BEST FOR Warm Weather Hiking Running Yoga