Talk

Playfoam is brilliant www.learningresources.co.uk/category/learning-resources-brands/playfoam.do

This modelling sand is also well worth buying www.argos.co.uk/product/6219280

Moon sand is great!! Dc use it on a big tray!!

I did looked into play foam and moon sand .they sound good also good price from amazon

@Snowydaysarehere how do you keep this contained in a tray??

Ours ends up like a day trip to Brighton!!

Threat of death +/binning the bloody stuff works a treat!!

In our house it goes...

Putty (as more firm)

Slime (you do end up with a few little blobs on the table)

Play doh (all over the floor, stuck to clothing a bloomin nightmare!!)

MY son has some cray Z sand, it comes with a tray which we place on a bigger tray to avoid spillages, or make the kids play with it outside now the weather is getting better.

None of those, I'd agree with other posters who have suggested kinetic/crazy sand. It doesn't stick to clothes and can be hoovered up easily. Just be careful as some of the cheap copies of it stain skin.
Slime, goop and putty are vile, if they get on carpets or clothes and set they are virtually impossible to remove. They are for outdoor play only in our house.