How does modal differ from cotton?

Cotton is a natural fibre obtained directly from the cotton plant, while modal is made from wood-based cellulose. Fabrics containing modal often feel particularly smooth and soft and have a flowing drape. Cotton fabrics can have a slightly firmer feel, depending on how they are made. Both fibres are popular choices for comfortable underwear and can also be blended together. Which material you prefer comes down to how it feels against your skin and the characteristics of the individual fabric.