The North Face Flux Power Stretch ¼ Zip Top is only 330g (11.6oz) so you can wear it or throw it in your pack and not feel liking you’re tacking on extra weight.

231g Polartec Power Stretch / 88% polyester, 12% elastane smooth-face jersey

The North Face Flux Power Stretch ¼ Zip Top is an alpine fit top that has soft and breathable Polartec Power Stretch. This is a body-hugging four-way stretch top that is remarkably breathable during exercise and provides warmth without weight. The Polartec Power Stretch features proprietary construction with two unique surface that are wind and abrasion resistant, and that pull moisture away from your skin keeping you dry, warm and comfortable.