This Merlin Sierra D30 Waterproof Explorer Boots review looks at a nubuck touring boot with a ratchet fastening and Hipora membrane. D3O protection, reinforced panels and a Vibram sole provide useful details for riders comparing adjustment and contact with the motorcycle.
This is a specification-based buying guide, not a hands-on road test. We may earn a commission from purchases through our links, at no extra cost to you.
Ratchet adjustment and reinforced nubuck construction
The micro-adjustable ratchet lets you set closure tension in small steps. Practise tightening and releasing it, then assess whether the upper holds your heel without concentrated pressure over the instep. Check the position of the D3O protection when your knee is forward and the foot rests on the peg, using your normal riding socks and trousers.
Nubuck leather combines with rubber reinforcement and high-density nylon panels. The Hipora membrane is the specified waterproof and breathable layer, with mesh inside for the lining. Consider the different surfaces when selecting cleaning and care products. Underfoot, a reinforced footbed, antibacterial insert and Vibram sole form the contact arrangement. Test the tread and gear-change overlay against your own motorcycle rather than assuming the named sole will feel the same on every peg. Check both walking flex and lever clearance before settling on a size, keeping the complete fastening secured throughout.
Protection and construction
The specification lists protection at the ankle. Check that these areas sit correctly when you adopt your riding position.
See our motorcycle boot reviews for more buying guides.
Related reading: Merlin Ruben Waterproof Leather Boots Review.