Can you please advise what the term 50/50 means? Also what tog rating is this particular item?

Hi there, thank you for your inquiry, The Swaddle UP™ 50/50 helps your baby to gradually adjust to sleeping un-swaddled. Simply unzip one ‘wing’, wait a few nights for your baby to adjust to the sensation of sleeping with one arm released, & then remove the second wing. Your baby is now transitioned!