Yes, slightly. 200/220 are designed for a heavier fabric and are therefore made a bit wider than 135/160.

• Want the same close look as your 135/160? Consider sizing down by one.
• Want regular fit or room for layering? Choose your usual size.

Choose based on the fit you want:

• Close fit: pick the smaller size.
• Regular fit: choose your usual size (or the larger one if you’re in-between).
• Relaxed fit / layering: pick the larger size.

The most precise method is to measure a T-shirt you already love and compare it to the table.

• Width is measured flat about 2 cm below the armhole (half chest).
• Garment chest ≈ width × 2 (circumference).
• Expect small variations — measurements may vary by up to ~2 cm.

Merino may settle slightly with washing and wear, but with proper care the fit stays looking great.

• Use a wool/delicate cycle with wool detergent.
• Avoid fabric softener and tumble drying.
• Air dry and gently reshape after washing.

For base layering, most people prefer a slightly closer fit so the layers sit neatly.

• Typically choose your usual size for a close/regular base-layer fit.
• If you’re between sizes, often choose the smaller size.