Looking for a "casual shirt" that will keep up with you on all your adventures? The Smartwool M MERINO SHORT SLEEVE TEE is a year-round men's t-shirt. Thanks to Core Spun technology, the Merino is wrapped around a nylon core, so you can still enjoy the feel of soft Merino wool on your skin, but the nylon makes the fabric extra durable. Merino wool is sustainably sourced, and the colour variations feature a more responsible plant-based dyeing technique, making this shirt environmentally friendly. You'll be as comfortable as possible while wearing it, even with a backpack on your back.