Compression base layers are the tightest option available—they fit like a second skin and actually press against your muscle groups, sometimes with targeted compression zones. This makes them excellent at wicking sweat since the fabric stays in full contact with your skin, leaving no air gaps for moisture to linger.
Where compression really shines is high-intensity, performance-oriented skiing. Racers and aggressive riders who are pushing hard all day often prefer this fit, and some find the gentle pressure helps reduce muscle fatigue on long days. The trade-off is that compression can feel restrictive if you're skiing casually or taking mellow runs, and it's definitely less comfortable for just hanging out après-ski.
For most skiers and snowboarders, a slim fit hits the sweet spot—it wicks efficiently without feeling like a vise. But if you're racing, training hard, or simply like that locked-in sensation, compression is worth considering.