Wear these with tall, synthetic socks and knee/shin guards. Your pants will also go inside the boot.
To put them on, open all of the buckles. It's a 2 step process: open buckle, then unhook the buckle. It detaches. Pull the top of the boot wide open to get your foot in. Attach the velcro around the top of the boot to hold the boot tight while you close the buckles. If a buckle is too long or short, pull the strap away from the boot and push the strap in or out of the opening to lengthen/shorten it.