Ready Made Hats are one-off, ready to send. Only one of each is available for purchase. Allow 2 to 3 weeks for delivery from time of purchase.
Sizing is critical and I always suggest that if you are say a 58.5 cm then go 59 cm, you will have it a long time and a tight hat is no fun.
A soft sewing tape is the best way to measure if you don’t know your size, just go around your hat line which is just above the eyes and ears.