Rico Essentials Cotton DK Yarn. This ultra-popular 100% mercerised cotton is a lightweight yarn suitable for those endless summer projects. The mercerisation process gives this yarn a sheen like no other, making it so smooth that it glides easily on your hooks and needles… great stitch definition too! With a generous selection of colours to choose from and be inspired by, try mixing and matching shades to find the perfect blend for any occasion. Shop the complete Rico collection, including Rico Essentials Cotton DK Yarn and Earn Loyalty Reward Points on all purchases. FREE Delivery options also available.