I was pretty upset at first thinking they didn’t adjust although it was advertised. Turns out they actually do adjust just not necessarily by the headband. Pulling on the muff part extends the silver metal part and makes them bigger! Just leaving the review for anyone who was also having a hard time figuring it out lol
The headband is NOT adjustable. These are one size only. What works for a baby will not work for an 8 year old. My 6 year old is unable to wear these as the band is too small. But for baby’s and toddlers I’m sure these are great.