Restrained (conditions)

* A restrained creature's speed becomes 0, and it can't benefit from bonuses to Speed. * Attack rolls against a restrained creature are made with advantage. * A restrained creature makes attacks rolls with disadvantage. * The restrained creature has disadvantage on Dexterity saving throws.

Source: 5e Core — official document

* A restrained creature’s speed becomes 0, and it can’t benefit from any bonus to its speed. * Attack rolls against the creature have advantage, and the creature’s attack rolls have disadvantage. * The creature has disadvantage on Dexterity saving throws.

Source: 5e Core — official document

While you have the Restrained condition, you experience the following effects. * Speed 0. Your Speed is 0 and can’t increase. * Attacks Affected. Attack rolls against you have Advantage, and your attack rolls have Disadvantage. * Saving Throws Affected. You have Disadvantage on Dexterity saving throws.

Source: 5e Core — official document