Metallica Mom. Metallica Mini. 🤘🖤⚡️ Custom lambskin leather Metallica jackets, handstitched with glacier twill details. What’s glacier twill? I’m glad you asked. It’s a style of tackle twill that’s no longer manufactured these days but has a herringbone/glacier zig-zag look to it which is created during the weaving process of the twill. Think Mets jerseys, or mid-2000s RoboPen jerseys. The 4th slide with the custom tag clearly illustrates the glacier pattern.