I'm not sure if this is the right group to ask. I've been having these pants for years. Not sure what material. It's super elastic but these little elastic threads keep coming

I'm not sure if this is the right group to ask. I've been having

I'm not sure if this is the right group to ask. I've been having

I'm not sure if this is the right group to ask. I've been having

I'm not sure if this is the right group to ask. I've been having

I'm not sure if this is the right group to ask. I've been having

Is the chain supposed to have this much black stuff? It's been

I'm not sure if this is the right group to ask. I've been having

I'm not sure if this is the right group to ask. I've been having

Is the chain supposed to have this much black stuff? It's been