How do I know which weight of fleece to choose?

Most outdoor manufacturers offer fleece garments in various weights for different activity levels and climates. When designing, think hard about the type of activity we'll do most often, and where we'll design for it, as well as how the body functions. Lightweight stretchy fleece garments are best for highly aerobic sports like cross-country skiing and running; the stretch allows arms to swing freely and makes the garment easier to add or shed. There are numerous fleece weights and styles to help outdoor enthusiasts find the perfect fit for their specific needs.