The Base Layer Fabric Guide: Merino vs Synthetic

Your base layer sits against your skin for days, so the fabric choice is personal and permanent. Merino and synthetic each have a loyal following, and for good reason.

Here is how they really compare on trail.

• Merino resists odor for days, synthetics stink after one
• Synthetic dries faster and costs much less
• Merino regulates temperature better in a wide range
• Synthetic is more durable against pack straps and washing

Many hikers split the difference with a merino top and synthetic legs. Pick what you can afford to wash less and wear longer.

Wash whichever you choose on cold and hang it to dry. Heat kills both fabrics faster than any trail ever will, so treat your base layer gently.