IT IS A US SIZE 4 WHICH IS EQUAL TO A UK SIZE 8. The Lululemon Women's Define Jacket in Black/Gold, UK Size 8 is a versatile activewear piece perfect for the spring season. Made from a blended fabric with a nylon outer shell and polyester insulation, it offers both style and practicality. The long sleeve, zip closure, and machine washable design make it easy to wear and care for, while the Lululemon brand ensures quality and performance. Ideal for yoga and other active pursuits, this basic jacket features a sleek black colour with a hint of gold, adding a touch of sophistication to your workout wardrobe.