Solberg-Maru makes workwear for people who spend time in cold industrial environments — the kind of cold that comes from unheated warehouses, exposed infrastructure catwalks, or the Lake Erie waterfront from November through April. Their thermal work layer is a fitted crew-neck shirt in brushed synthetic fleece-back jersey, designed to be worn under a jacket or hi-vis vest without bunching. The exterior is smooth enough to slide under outerwear; the interior is deeply brushed and traps heat efficiently. Reinforced panels run along the forearms and across the upper back — these areas get the most friction from tools, harnesses, and machinery.

Available in safety orange, slate, and a dark olive. No branding on the front — just a small woven label at the inside collar. The stitching at the cuffs is doubled and uses a stretch-resistant thread that doesn't fail when you're gripping something cold. This is a shirt that has never once been worn to a party and doesn't need to be.