Green Wellies

I had to buy some GREEN wellies today. They cost me nearly £9 from B&Q.
I really wanted some nice BLACK shiney ones but they didn't have any so I had to do with the dark GREEN shiney ones that I got from B&Q. They do have BLACK on them but that's just the soles.
I am a size 5 shoe and I thought that I would need to get my wellies in 5's but I tried 5's on and they were kind of loose so I tried on the 4's and to my astonishment they fit me. I was so shocked and surprised but I guess that wellies are a bigger size than shoes. I would never get in a size 4 shoe.
Anyway for nearly £9 they are only going to get worn just the once because I only need to wear them once so it kind of seems like a shame but I'm not going to wear them down the street or anything. I put them on for an hour today and they made me feet sweat but I was just getting use to them before I have to wear them to go into the river.