The “No sticky” bonus is also referred to “lifeline bonus” or “parachute bonus”. It works like this: For example, you deposit €100 with a 100% “no sticky” bonus. You get €200 to play with, the first €100 you play as normal and you can cash out anytime you want on that balance. The other €100 you get is like “a second chance”. In normal “sticky” bonuses the €200 would be attached to the whole bonus wager.
Make sure you can use this offers from your country. Use the "countries" function in the menu for more offers from your country.