How to Waterproof THUNDER PRO GTX WNS Backpacking Boots

By Zamberlan Italian Hiking Boots, Hunting Boots, and ... | Published: 2026-10-24

Category: How-to Guides

Keep your Zamberlan Thunder Pro GTX WNS boots performing at their best. This guide covers cleaning, re-proofing, and caring for the Gore-Tex membrane and leather upper.

Quick answer

Waterproof your Thunder Pro GTX WNS boots by first cleaning off dirt, then applying a dedicated Gore-Tex-friendly spray or wax to the suede leather, and finally re-treating the DWR coating on the fabric sections.

Why regular waterproofing matters for the Thunder Pro GTX WNS

The Thunder Pro GTX WNS uses a Gore-Tex membrane for waterproofing, but the outer suede leather and fabric upper can still absorb moisture over time. This leads to heavier boots and slower drying. Regular re-proofing keeps the outer materials water-repellent so the membrane can do its job without extra strain.

Zamberlan's Active Heel Pad (AHP) construction adds low-density PU cushioning in the heel. While this improves comfort under heavy packs, it also means the boot's internal structure benefits from staying dry to maintain its shape and support.

Choosing the right waterproofing product

Not all waterproofing treatments are safe for Gore-Tex boots. Avoid heavy oils or grease-based waxes that can clog the membrane's pores. Instead, use a spray-on or rub-on treatment labeled for Gore-Tex and suede/nubuck leather. These products restore the Durable Water Repellent (DWR) finish without blocking breathability.

For the Thunder Pro's suede panels, a wax-based cream designed for smooth and rough-out leathers works well. For the fabric sections, a DWR spray is usually sufficient.

How to waterproof your Thunder Pro GTX WNS boots

1. Remove laces and insoles: Take out the laces and the removable insoles. This lets you clean and treat every part of the boot evenly and prevents product buildup on the laces. Common mistake: leaving insoles in traps moisture and treatment chemicals, which can cause odor or irritation.
2. Brush off loose dirt and mud: Use a soft brush or damp cloth to remove dirt from the suede leather and fabric sections. For stubborn mud, let it dry completely before brushing. Avoid soaking the boot at this stage. Checkpoint: if dirt remains, the waterproofing product won't bond properly to the material.
3. Clean the upper with a gentle cleaner: Apply a small amount of Gore-Tex-safe boot cleaner to a damp cloth and wipe the entire upper. Focus on the suede panels and the tongue. Rinse the cloth and wipe again to remove soap residue. Let the boots air dry completely (away from direct heat) for at least 6–8 hours. Common mistake: using regular soap or detergent can strip the DWR coating and damage the leather.
4. Apply waterproofing treatment to the suede leather: Use a wax-based cream or spray designed for suede/nubuck. Apply a thin, even layer to the suede panels. For spray, hold the can 6–8 inches away and mist lightly. Let it absorb for 10 minutes, then wipe off any excess with a clean cloth. Checkpoint: if the suede darkens unevenly, you applied too much. Blot with a dry cloth to even it out.
5. Restore DWR on fabric sections: Spray a Gore-Tex-compatible DWR treatment onto the fabric areas (collar, tongue, and any mesh panels). Hold the can 6–8 inches away and apply in a sweeping motion. Let the boots dry for 24 hours in a well-ventilated area away from radiators or sunlight. Common mistake: applying DWR to wet boots. Always start with completely dry boots for the best adhesion.
6. Re-lace and test: Once fully dry, reinsert the insoles and laces. To test the waterproofing, sprinkle a few drops of water on the suede and fabric. If the water beads up and rolls off, the treatment worked. If it soaks in, apply another light coat and let dry again. Checkpoint: reapply treatment every 3–4 months or after heavy use in wet conditions.

Product facts

THUNDER PRO GTX WNS - Sepia: The Thunder Pro GTX WNS features Zamberlan's Active Heel Pad (AHP) construction, which places a low-density PU insert in the heel of the insole to transfer impact directly to the sole for continuous cushioning. Keeping the boot dry inside helps the PU insert maintain its cushioning properties and prevents premature breakdown of the insole.
THUNDER PRO GTX WNS - Sepia