Do compression base layers actually improve skiing performance?

The evidence is mixed but leaning positive for specific benefits. Compression has been shown to reduce muscle vibration during dynamic movements, which may decrease muscle fatigue and micro-trauma during aggressive skiing. Enhanced proprioception from the tight fit can improve balance and body awareness. The recovery benefits—reduced muscle soreness and faster clearance of metabolic waste when worn post-activity—are better supported by research. However, compression won't make you a better skier on its own; the benefits are marginal and most noticeable during high-intensity, high-volume skiing.