Smartwool Merino 1/4 Zip 150 Baselayer - Men's 2XL Black. This top uses our lightest-weight Merino fabric wrapped around a nylon core to increase durability while still keeping the 100percent soft Merino wool you love next to skin. Side seams help minimize chafing while wearing a pack and offer a body-enhancing fit. Select colorways feature a more responsible plant based dye technique. This base layer is comfortable powerful sustainable and frankly do-it-all-able. Specifications for Smartwool Merino 150 Baselayer 1/4 Zip - Men's: Manufacturer: Smartwool Sleeve Length: Long Sleeve Age Group: Adults Apparel Fit: Slim Gender: Male Application: Baselayer Top Layering Casual Shirt Style: Lightweight Thermal Fabric/Material: 87percent Merino Wool 13percent Nylon Quantity: 1 Fastener/Closure Type: 1/4 Zip Fire Resistant: No Sleeve Type: Long Sleeve Features of Smartwool Merino 150 Baselayer 1/4 Zip - Men's: Our lightest weight Merino jersey fabric uses a nylon core to increase durability while still keeping 100percent Merino wool next to skin; Offset shoulder and side seams designed to increase comfort and minimize chafing while wearing a backpack; Side seams wrap to front for body-enhancing fit; Flatlock seam construction designed to minimize chafing; 8" (20 cm) center front zip with semi-locking slider; Indigo Blue colorway features plant-based dye technique Package Contents: Smartwool Merino 150 Baselayer 1/4 Zip - Men's Smartwool SW000752545XL: Merino 1/4 Zip 150 Baselayer - Men's Extra Large Light Gray Heather Smartwool SW000752545S: Merino 1/4 Zip 150 Baselayer - Men's Small Light Gray Heather Smartwool SW000752545M: Merino 1/4 Zip 150 Baselayer - Men's Medium Light Gray Heather Smartwool SW000752001XL: Merino 1/4 Zip 150 Baselayer - Men's Extra Large Black Smartwool SW000752001S: Merino 1/4 Zip 150 Baselayer - Men's Small Black Smartwool SW000752001L: Merino 1/4 Zip 150 Baselayer - Men's Large Black Smartwool SW000752001M: Merino 1/4 Zip 150 Baselayer - Men's Medium Black Smartwool SW000752545L: Merino 1/4 Zip 150 Baselayer - Men's Large Light Gray Heather Smartwool SW000752001XXL: Merino 1/4 Zip 150 Baselayer - Men's 2XL Black Smartwool SW000752001XXL: Merino 1/4 Zip 150 Baselayer - Men's 2XL Black