I knitted them for a two and four year old, but the pattern can easily be adjusted for kids of other ages or grown ups by adding 4, 8 or 12 stitches more and adjusting the length of the front and back panel.
The top to bottom knitting was inspired by JCasas Neighborly that I have made on several occasions.
Neck warmer
Sizes
Approximately 2 years and (4 years)
Needles
3.5 mm circulars (US 4) and 4 mm circulars (US 6), (both my circulars were 40 cm long (15.7 in)
Yarn: Drops Merino extra fine
Notions
Stitch marker
Stitch holder or scrap thread
Abbreviations
k – knit
p-purl
Pattern
Cast on 92 (96) stitches on 3.5 mm (US 4) needles. Join the stitches making sure not to twist and place marker to designate the row.
k 2 and p 2 to the end of row
Continue to [k2, p2] until the piece measures 6 cm (2.4 in)
k four rounds.
Switch to 4mm (US 6) needles and k four more rounds.
Bind off 7 (8) stitches after marker, k 39 (40) and place these stitches on a stitch holder or a scrap yarn. These 39 (40) stitches are for the back panel of the neck warmer.
Bind off 7 (8) stitches and k 39 (40). These are the stitches for the front panel of the neck warmer and the ones you will continue to work on now. Turn work so you are looking at the wrong side (purled row). Knit the following rows like this:
From wrong side: k3, p 33 (34), k3
From right side: k 39 (40)
Continue with this until your work measures 12 cm (4.7 in) or your desired length from the point when you divided the work in back and front. k 6 rows and bind off.
Now take the stitches that you put on the stitch holder or scrap yarn (for the back of the neck warmer) and do the same as with the front.
Happy knit!