I have several of these gaiters. I use them for biking, gardening, and water sports. They are a good size, maybe a little too loose for me, but better than no neck protection. 

The sun gaiter and sun sleeves are essential for driving to work in horrid Miami (I'm a New Yorker), but I wish the sun gaiter was a bit wider on one end so it could cover the chest area a bit. (BTW, never stop selling the solbar sunblock...i need it always.