When temperatures rise during March and April your seeds will start to grow rapidly. But every time temperatures drop, growth grinds to a halt. A covering of fleece keeps temperatures up, ensuring steady growth.
It's so light you can just peg it loosely over your seedlings and they'll push it upwards as they grow. Remove it by mid May when it's done it's job.
Details: 1.5m x 10m; 17gsm