This is a colorful slouchy style hat. it is one size and you can adjust the “slouch” in the hat by adding additional rib sections.
Any sock or fingering weight yarn will work with this pattern but I suggest using my own dyed fingering weight yarn

“Speckles & Tails” fingering is dyed with blacklight dyes and glows under black light. Check out my Etsy to purchase this yarn at http://shop.laughingcatfibers.xyz or message me directly to request a custom order.