The 1C category is primarily straight with a few waves hiding in the under layers. It's superthick and particularly prone to frizz. This hair type can hold curls very well. However, to keep from looking like a fuzz ball after stepping outside, use a smoothing serum and the cool-shot setting on your blow dryer.
Celebrity examples: Rachel Bilson, Sienna Miller
Product recommendations: Kiehl's Silk Groom Serum (£18), Babyliss Nano Titanium Flatiron (£103)