Does merino wool itch?

High-trust sources like cleverhiker.com note that even quality 150gsm merino can be 'mildly itchy' for sensitive wearers. Smartwool's Classic Thermal line is widely described as soft and non-itchy across base-mag.com and gearjunkie.com coverage, while r/onebag discussion confirms a meaningful minority of people simply find merino scratchy regardless of brand.