Found a site that sold Vans Ultracush insoles and put them in my Sk8 Hi's. Such a good decision. The difference in thickness is striking. Link in the comments for the website
3 Ways to Clean Shoe Insoles - wikiHow
FOOTSOULS for Authentic, Era, and Slip On Vans – FEEL YOUR SOUL
Vans Snow V3 PopCush Insole
Insoles are not suitable for flat feet - Blog ZaMi.es
FOOTSOULS for Old Skool and SK8-HI Vans – FEEL YOUR SOUL