The Heerlen Socks are featured in my book Colorwork Knitting from Head to Toe (2026). Dutch version: Breien met Kleur (2023)

Materials
Scheepjes Metropolis (50g/200m; 75% Merino, 25% Nylon)
Yarn A: 032 Abu Dhabi x 1 ball
Yarn B: 004 Kabul x 1 ball
Yarn C: 019 Marseille x 1 ball

Recommended needle sizes
2.25mm for toe
2.5mm for rest

Gauge
34 sts and 36 rounds measures 10 x 10cm over colourwork stockinette in the round.