The cold weather Safe guardion and low-light visibility you want with out the weight (and noise) you don't, the Saucony Vizi-Pro SonicLite HD Vest for Boys is built of high-density ultra-fine microfiber with ultimate visibility, Safe guarding you from the elements; blocking wind and shedding light rain and lighting you up before sunrise and after sunset. Reflective mesh paneling delivers both superior breathability and added visibility in low light conditions.