Very similar to what my son did with his new kangaroo skin soccer (futbol) boots. He would lace his new boots on with two pairs of socks, then stand in a tub of warm water until they were completely soaked through....then he would play soccer, or just run and pass the ball around for about 30 minutes....then he carefully removed the laces and carefully removed the boots and allowed them to air dry. After that they felt like custom made boots, made just for his feet. Of course they were made to last just a season maybe 15 games and 30 or so practices. Pricey for $140 boots.
Dave Theobald