Mountain Equipment Company on Instagram: "It’s Base Layer Week ❄️ Get 20% off select base layers until December 21st. Here’s how to pick the right one: 〰️ T0: ultra-light for high-output activities 〰️ T1: light warmth for cool days 〰️ T2: the sweet spot - warm, breathable, and versatile 〰️ T3: heavyweight for deep-cold days 1️⃣ Choose your fabric based on the activity 〰️ Merino = comfort + odour control 〰️ Synthetics = best for fast-paced movement 2️⃣ Pick the right weight for the weather 〰️ The