FZN Merino Pant

 SIZE CHART
$89.95

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You're going to LOVE the fit. Try it for 30 days and experience our perfect fit. If you don't love it, send it back for an exchange or full refund*. Risk free.
*Exchange and refunds only apply to orders placed from Ride509.com.

FZN stands for Five Zero Nine, not frozen, and that’s exactly how you’ll feel in the 509 FZN Merino Pant. This base layer pant provides versatile midweight warmth with a high-performance Alpine Merino wool blend that’s naturally breathable, fast-drying, and odor-repellent—all without the itch. It’s far superior to conventional fabrics and compared to grandpa’s wool knickers, it’s like upgrading your sled from his 1978 Panther to a PRO-RMK®.



  • Materials: Alpine Merino - 250 GSM 20 micron wool, blended with 40% Bamboo Viscose, and 10% nylon for structure and durability
  • Warmth: LVL [2]


WARNING for California Residents

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Unisex Apparel Size Chart

Chest: Measured under arms and around the fullest part of the chest. Keep the tape level across the back and comfortably loose.

Sleeve: With the arm fully extended, measure the center-back of the neck, at the spine, to the wrist bone.

Waist: Measure around the natural waist line with a comfortably loose tape.

Inseam: Without footwear on, measure the inside of the leg, from groin to the floor.