Collocations for supple - adj.

be, feel, look
The cream leaves your skin feeling soft and supple.

become, get
He was gradually getting more supple.

keep, remain, stay
exercises that will help you to keep supple

make sth
a cream that is used on dry skins to make them soft and supple

keep sth
You must exercise your joints to keep them supple.

extremely, fairly, very, etc.

soft and supple

Supple is used with these nouns:
skin