Merrell Women's Siren 4 Thermo Mid Zip Waterproof Hiking Boot

The Merrell Women's Siren 4 Thermo Mid Zip Hiking Boots are winter-ready with a women's-specific fit that combines function and wearability with 200G of insulation for lightweight, all-day warmth.

DETAILS

Style Number: J037412Z
Weight: 19 oz. / 538 g
Heel-to-Toe Drop: 8 mm
Lug: 5 mm
Upper: Leather

FEATURES

• Waterproof membrane seals out water and lets moisture escape
• Waterproof full grain leather and knit upper
• 100% recycled laces and webbing
• Heavy-duty, Waterproof, YKK medial zipper for easy on and off
• Bellows tongue keeps out debris
• Protective and abrasion resistant rubber heel and toe cap
• 100% recycled fleece lining
• 200 grams Primaloft® Gold Eco Series synthetic insulation
• SOLARCORE® Aerogel insole provides underfoot superior warmth while being extremely flexible and ultra-thin
• 100% recycled mesh footbed cover
• Cleansport NXT™ treated for natural odor control
• 5% recycled removable PU footbed
• FloatPro™ Foam midsole for lightweight comfort that lasts
• Vibram Icetrek outsole designed to provide the improved grip on very cold, icy, or snowy surfaces
• Vibram traction lugs specifically designed to increase traction and shed debris with each step

Most orders ship within 1 business day

During busy seasons, processing may take up to 2 days

Same‑Day Shipping

Mon–Fri: Orders placed by 12 PM EST
Saturday: Orders placed by 10 AM EST
Orders placed after these times, on Sundays, or on holidays ship the next business day

Free Shipping
Free shipping on all U.S. orders over $75 (continental U.S.)

Carriers Used
Orders ship via USPS or UPS
Weekend/late‑Friday orders may ship USPS to meet timing requirements

Alaska, Hawaii, Military & U.S. Territories
Shipped via USPS Standard/Priority Mail
Typical transit times:
AK/HI/Territories: ~3 days (not guaranteed)
Military addresses: 10–15 days

Transit Times
USPS Priority Mail may display “1‑Day,” “2‑Day,” or “3‑Day,” which reflects USPS’s estimate after the package ships
These estimates do not include processing time.

Need Faster Shipping?
Contact us to request an upgrade to expedited services.