The black bottom unscrews to release the interior bottle and outer sleeve along with the design insert

The shaker is not truly insulated or sealed double wall if youre expecting performance on par with vacuum sealed tumblers like a tervis or thermos

Easy to clean great for my boys for after school in between school and activities i was specifically looking for a quiet shaker bottle for my electrolytes that would still be cold after working out and for that purpose the bottle itself works as desired