after seeing a lot of people ( on instagram ) siting pods on chest -- i have been doing this for a few months now and absorption is excellent for me -- i dont notice it there at all ----- think like dexcom say stomach sites for their sensors , libre say upper arms only for sensors , omnipod say stomach and upper arms for pods.........it could be that is only where they have sited and got proven results-------i have sited pods on upper arm , lower arm , stomach , just under ribcage , lower back thighs , but not calf so far ---- all have been ok