Grotrax 803 Year Round Green Mixture Grass Roll, 100 Square FeetGrotrax provides an easier, cheaper, better way to grow grass. The grass seed and fertilizer are sandwiched between 2 bio fabric layers. Grotrax holds 6X its weight in water. For fast germination and uniform growth, simply roll, water and watch it grow. Highlights: Size: 100 Square Feet Simply roll, water and watch it grow The patented Bio Fabric prevents seeds from washing away and holds 6x its weight in water, keeping seeds moist for germination