Cut a saddle-shaped oval from the sock, big enough to wrap around the microphone. Leave 1/2-inch extra material for a seam around the edge of the oval. Fold the oval sock in half, and sew it shut around the edges, except for a small hole for inserting the microphone. Trim off any extra sock material around the edges, being careful not to cut any thread.
Cut a saddle-shaped oval from the foam, slightly bigger than the sock oval. Fold it in half around the sock material and sew it shut around the edges, except for the hole for inserting the microphone.
Trim off any extra foam around the edges. Slide your new windscreen on the microphone.