Meet your temperature control headquarters, the MONS ROYALE Cascade Merino Base Layer 1/4 Zip Long Sleeve Top transforms how you think about base layers with its game changing 4-way stretch that moves with you, while delivering all the cozy benefits of premium merino wool. That strategic 1/4 zip becomes your personal climate dial, letting you dump heat instantly when the going gets tough, while thoughtful details like flatlock seams and thumb loops keep you dialed in for the long haul.