Modal is a “semi-synthetic” fabric that is commonly combined with other fibers to create a soft and long-lasting material. Its silky-smooth feel makes it one of the more luxurious vegan fabrics and it’s generally found in the garments from higher-end sustainable clothing brands. Modal is very similar to regular viscose rayon. However, it is also stronger, more breathable, and has the ability to withstand excessive moisture. Like with many of the fabrics used in sustainable and ethical fashion, modal does have its ecological benefits. It doesn’t require as many resources as other materials and is made with plant-based materials.
Polyester is hydrophobic. For this reason, polyester fabrics don’t absorb perspiration, or other fluids, leaving the wearer with a moist, clammy feel. Polyester fibers typically have a low level of wicking. Relative to cotton, polyester is stronger, with a greater ability to stretch.