It's time to count sheep!
About the pattern:
•  it’s a bottom-up beanie
•  the rib is knitted with double thread of DROPS Baby Merino
•  the main part is knitted with double thread:1 thread of DROPS Baby Merino + 1 thread of DROPS Alpaca
•  you need about 300 m of yarn to knit this beanie
Knitting gauge:
•  K2 P2 Rib (3.5 mm needles): 22 stitches in 10 cm (the number of rows in this swatch may not be considered)
•  Stockinette Stitch (3.5 mm needles): 24 stitches in 10 cm and 30 rows in 10 cm 
Needles:
•  3.5 mm (US 4) circular needles with 40 cm needle cord
•  3.5 mm (US 4) stocking needles to form the top of the beanie (or 3.5 mm circular needles if you prefer the magic loop technique)
Sizes grid (head circumference):
•  S: 54-56 cm
•  M: 56.1-57.9 cm
•  L: 58-60 cm
Skills needed to knit the beanie: multi-color knitting, casting on, binding off, knitting in the round, flat knitting, knitting K2 P2 Rib