Rab Forge Long Sleeve Top The Forge Long Sleeve Top from Rab is a lightweight Merino blend baselayer optimised for wicking, warmth and temperature regulation. Ideal for outdoor adventures, the Rab Forge Long Sleeve Top is the perfect addition to your walking wardrobe. Constructed using Merino Wool, the Forge Top provides you with optimal warming properties to keep you nicely warm when exploring the great outdoors. Flatlock seams are strong and soft to ensure complete comfort at all times whilst reducing the risks of chafing and irritation so you can go further for longer in complete comfort. The slim fit design sits nicely against the skin to enhance comfort while also allowing for a full range of mobility. Sustainability - 32% of Polyester used is recycled.