Earth Mantle Core High Resolution Stock Photography and Images Alamy CORE PartnerShip What Is Earth's Core Made Up Of? Scientists' Discovered The Last Core Zip Jacket. A tailored, full zip performance jacket made from smooth, lightweight compression fabric that molds to the body while allowing total freedom of movement. Designed with a high collar, subtle contour seams, and streamlined sleeves for a sculpted, elongated look. The zip closure makes it easy to layer over bras or tanks, and the cropped length gives it a modern, flattering edge.