This product is expensive, but it greatly improves solid color yarn for hats and headbands. I've run out though, so you'll need 2 rolls to make a hat, working with 1 worsted thread and 1 strand of this.
Bernat Pipsqueak Yarn, 3.5 Oz, Gauge 5 Bulky, Candy Girl
22 Review
62 Acrylic Yarn Skeins Crochet Beginner Kit - 2170 Yards, 2 Hooks,2 Needles & 10 Stitch Markers For Adults Kids
22 Review
Crochet & Knit Starter Kit - Inscraft 52 Acrylic Yarn Skeins, 2 Hooks, Needles, Stitch Markers & More!
32 Review
Soft And Durable Baby Blue Bernat Sport Yarn, 12.3 Oz, Gauge 3 Light, 100% Acrylic
32 Review