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For cold winter days, it is important that your head is kept especially warm. With super bulky yarn and a stitch pattern that creates a dense fabric, this hat is just what you need.
As it is worked on very large needles as well, it works up superfast, in case there are any surprise snow excursions.
The grey colour and herringbone pattern remind me of stone patterns in Irish ringforts, which is where the name comes from. Caiseal is an Irish word for ringfort, also known in the anglicized version Cashel.

Sizes
Child 1, Child 2, (Teenager, Adult 1, Adult 2), Adult 3, Adult 4
Circumference:
34.5, 40, 46, 51.5, 53.5, 57.5, 63 cm / 13 ½, 15 ¾, 18, 20 ¼, 21, 22 ½ , 25 inch
The main pattern of the hat is not going to be very stretchy, so the hat should be worn with minimal negative ease.

Yarn
Approx. 39, 53, (66, 83, 96), 107, 129 m / 43, 58, (72, 91, 105), 117, 141 yards of Super Bulky Yarn
Sample worked in Ragazza Lei by Lana Grossa
100% Merino – 40 m / 50 g

Needles
12 mm/ US size 17 needles for working in the round or size required to match gauge.
8 mm/ US size 11 needles for working in the round

Low Vision Supported
The pattern contains a version that is specifically optimized for low vision attributes. It has the following features:
The font is 22pt minimum and all black throughout the pattern.
A sans serif font, with no italics is used.
All instructions are written out.
There is no chart in this pattern.

This pattern has been professionally tech edited and tested.