When he took a few steps, his boot crunched on something.

Once a boot crunched within a few feet above me as I lay still.

After a bit I heard boots crunching and the rider came back.

After no more than a dozen steps, she heard boots crunching on snow behind her.

Their boots crunched over the gravel path as he thought out his next words.

She heard footsteps next, heavy boots crunching the deep snow.

Behind him, the major's boots crunched more assuredly than his own.

I walked about, and my boots crunched on the coarse sand.

His boots crunched and ground on the rock, the sound echoing in the deep silence.

Phillip walked around the car, his boots crunching on the gravel.