A tear on my seat

Do anyone of you have this problem before ? I can't really remember when this happened but when I spotted this, it is too late for any remedial works. The size of the tear just grow and grow day after day. 

What kind of solution do I have ? Halfcut ? Can I just change the lower piece of the seat ?

Share your ideas and comments here ! I appreciate it, or you have something to sell to me or trade ? Drop me an email at worldofht81s@gmail.com