Here's what other sites are saying:
Aquaseal Footwear Scent Free Cream 4 oz 283835. Will not harm waterproof boot liners beneath the leather and allows the leather to still breathe.
Where to Buy
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Nikwax Conditioner for Leather
Nikwax Nubuck & Suede Proof
$9 - $10
Gear Aid ReviveX Leather Gel Water Repellent & Conditioner
Obenauf's Heavy Duty LP
Gear Aid Freesole Shoe & Boot Repair