SIZE
SMALL: Circumference 20"- 21 1/2"
MEDIUM: Circumference 21 1/2"- 22 1/2"
LARGE: Circumference 22 1/2"- 23 1/2"
DENSITY
150g: Natural fullness
Best choice if you are aiming for a natural looking install. Lexi's opinion "150g looks best for bob styles. You don't want a short cut to look bulky so 150g works great if you're going for a shorter style style."
180g: Full
Best choice for all textures if you are going for a full look. Lexi's opinion, "180g is the perfect choice for natural looking body curls, waves, straight, or wet curls. The best of all worlds because in any hair state, it will still look full and natural"
200g: Extra full
Bes choice if you are getting layers. Lexi's opinion, "200g is my go to if I want to do layers. Because of the amount of hair, when you layer it, you wont have to worry about the bottom looking thin. If you are into big, curly hair I'd definitely recommend this to you too."