Size UK 8.5 to UK 10 - trim to size carefully if too big 
Bootking recommend Svartz Absorber Footbed for all boots and running shoes to improve fit, comfort and posture when walking
Altberg have spent years working with the MOD and special forces to produce a footbed which enhances any boot and the comfort of the wearer. You cannot buy better if you want the ultimate comfort walking and hiking.
The underfoot shape of the Absorber Footbed supports the natural alignment of the foot, ankle and knees.
The result is improved balance and maximum shock absorption when running, tabbing and hiking on rough terrain.
The covering of the footbed is Meshtex®, which has minimal water retention
details
material:
Maximum cushioning and shock absorption
thickness:
5mm - interchangeable with footbeds in most makes of boots and running shoes
footbed covering:
Meshtex® - breathable mesh with minimal water retention