Life on track Men's Long Sleeve Base Layer Compression Shirt 82% Polyester/ 18% Spandex Compression base-layers have 4-way stretch compression performance, which grab your muscles tightly and provide better performance for all your activities. Compression base-layers are built with Flat-seam by 4-needle Feed-Off-The-Arm sewing machine and it makes your skin to feel more comfortable and softer. Unique designs are printed with non-toxic ingredients are not harmful for your skins and it lasts for a long time. Quick-absorption, Fast-drying, Comfortable and Breathable materials. Products made by multi functional advanced fabric which provides the best condition for athletes.