If you live in Iowa, chances are high you already know what nostalgic ride this hat is named for. The “Silly Silo” was a ride in which you stood against the inside of the circular walls while it would spin faster and faster; then the floor would drop and you would be stuck to the wall! Another experience was peering inside from the top and watching all the riders have their fun. Worked in the round with super bulky yarn, the hat features a simple rib brim with rows of swirling stitches. One size.