This is always a good choice! The SAIJA half-zip is ultralight and fits snugly against your body. The recycled PONTETORTO® fleece provides unparalleled comfort. That’s why you’ll almost always want to take this with you. You won’t even notice it when you’re wearing it, and you certainly won’t notice it in your backpack! It’s ideal for year-round use: as a base layer in summer when the sun isn’t too strong, and as one of your layers for optimal insulation well into winter.