Laser Shield How Much Do The Nike Laser II's Stretch?

How much do the nike laser II's stretch? - laser shield

I bought the Nike Laser II, and are a little tight. (i got synthetically.) So, how far behind? I strike in the 11's and they were great, and so I went to 10.5 but wonder if it will be too small. Moreover, it seems that getting my feet sign on the packaging a bit much. Is this normal?