Squat Nimbleness - Fullfeat

You are uncommonly nimble for your race. You gain the following benefits:

• Increase your walking speed by 5 feet.
• You can move through the space of any creature that is of a size larger than yours. If you are a Halfling, you can also end your movement on--and occupy--this space along with the larger creature. 
• You gain proficiency in the Acrobatics or Athletics skill (your choice). 
• You have advantage on any Strength (Athletics) or Dexterity (Acrobatics) check you make to escape from being grappled or restrained. 
• When you take the Dash action, any opportunity attacks made against you have disadvantage until the start of your next turn. 

[Part of a project to upgrade Half-feats (those granting lesser abilities/effects alongside a single point of ability score increase) to Fullfeats (foregoing any ability score increase to receive a more fully-balanced ability/effect).]