Amazon.com: Wilkins Premium Midsole Marker for Customization Paint on Leather, Suede, Fabric and Soft Foam for 2-4 Pair of Shoes (Black) : Arts, Crafts & Sewing
Painted the dirty boost with a Sharpie oil based paint marker bought from hobby lobby. Was about $5. My hand wasn't exactly steady but for the most part it worked well. :
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