Hi, i,m currently (my hubby) is currently building me a large run for my 3 girls but i,m stuck as to what to lay on the ground as it is slabbed , ive heard rubber chippings is a great idea as its kind to their feet , soft , warm , easy to clean and keep fresh . It is quite expensive apparently but once its down its there for a long time. Does anyone already use these rubber chippings who could advise me on this ? would be much appreciated