Siren 3 Mid GTX (W)

Colour: Blue Smoke
Size: 4
Sizing guide

Size Conversion Chart

Fit note: Sizing can vary slightly by brand and style. If you’re between sizes, we usually recommend going up half a size.

Wide fit: Wide fit options are available in selected styles.

EU UK US (Men) US (Women)
36 3 5
37 4 6
38 5 7
39 6 7 8
40 6.5 7.5 8.5
41 7 8 9
42 8 9 10
43 9 10 11
44 9.5 10.5 11.5
45 10.5 11.5 12.5
46 11 12 13
47 12 13 14

Need help? Message us and we’ll recommend the best fit based on your foot width and support needs.

 


Find Your Perfect Fit (It’s Not Just Size)

Most people think they need a bigger size…
but in reality, they need a wider fit.


Understanding Shoe Widths

Width What It Means How It Feels
F Narrow Snug, slim fit
G Standard Comfortable for most
H Wide More room across the foot
K Extra Wide Maximum space & comfort

👉 Quick tip:
If your shoes feel tight at the sides—but long enough—you likely need a wider fit.

 

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Merrell Siren 3 Mid GTX – Women’s Waterproof Hiking Boot

The Merrell Siren 3 Mid GTX is a high-performance women’s hiking boot built for precision fit, waterproof protection, and trail-ready stability.

Engineered specifically for the shape of a woman’s foot, this lightweight hiker offers advanced support, cushioning, and grip for confident movement across varied terrain. With a breathable GORE‑TEX® membrane and a Vibram® Megagrip outsole, the Siren 3 Mid GTX keeps your feet dry, stable, and secure—even on wet, rugged trails.


Key Features:

  • GORE‑TEX® Waterproof Membrane – Keeps feet dry while allowing natural breathability

  • Engineered for Women’s Feet – Anatomical fit and Q FORM™ 2 dual-density midsole for enhanced alignment and comfort

  • Vibram® Megagrip Outsole – Superior traction on wet and dry surfaces

  • Lightweight Mid-Cut Design – Provides ankle support without slowing you down

  • Protective Rubber Toe Cap – Guards against rocks and debris

  • Breathable Mesh and TPU Upper – Durable and comfortable for long treks

  • Molded Nylon Arch Shank – Adds stability on uneven ground


Why Women Choose the Merrell Siren 3 Mid GTX:

  • 🥾 Perfect for day hikes, wet trails, and unpredictable weather

  • 👣 Biomechanically designed for women’s gait and foot shape

  • 🌧 Waterproof and breathable for all-season use

  • 🧍♀️ Stable, supportive, and comfortable enough for all-day hikes


Lightweight Support for Serious Trail Performance

The Merrell Siren 3 Mid GTX offers everything you need in a women's hiking boot—comfort, protection, and trail-tough performance. Whether you're heading out for a weekend hike or tackling technical terrain, this boot delivers the stability and support you need to keep going.

Specialist Fit & Comfort Promise

Every product is selected or fitted to reduce stress on feet, knees, hips and back.

Trusted Quality Only

We only stock products we would confidently recommend to our own patients and families.

Quality You Can Trust

Produced in certified facilities with strict quality control for peace of mind.