A lightweight hat that covers the ears, with interesting stitch-pattern on both sides. Finished circumference: 18 inches/
46 cm, and height: 8 inches/20 cm.

Why reversible biking hat you ask? Because it is a perfect underneath-the-helmet hat for winter-time biking, it covers the ears, it stays put quite nicely on differently sized heads due to the ribbing, and there is design interest both on the inside and the outside (which I guess makes both sides the outside?).

Techniques
Casting on, knit stitches (k), purl stitches (p), yarn over (yo),
knit two together (k2tog), slip one stitch, knit the next, pass
the slipped stitch over the knit stitch (skp).

UPDATE:
A new version of the pattern was uploaded on November 21st 2010, to adress some errors in the last few lines of decreasing. The blog post has also been updated. I’m sorry for any inconvenience! I’ve also updated the pattern (dec. 2011) to include a larger size, as many people were finding the hat a bit on the small size for men.

See http://indigorchid.wordpress.com/2011/11/14/reversible-bi... for tips on altering the pattern!