i bought this for
Sony Walkman NWZ-E475 E Series 16GB MP3 Player, 2" LCD, FM Radio, Voice Recorder, EX Headphones Included, BLACK,
but because the walkman is 10% thinner than other version's it move's around in the case a bit while using the menu back + option's, also at the top of the flip where you insert the walkman it could do with a an elastic strap to hold the device in because if you open it up while upside down accidently, it will fall out.
all option's including charging can be accessed while inside the case, not sure about the sock though it's not needed or used.
it might be OK for other walkman's, i like mine to fit tightly in their case'es, if it did i would have given it 5*****.