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$(".size").on('click','a', function(){
    $(this).toggleClass('checked').siblings().removeClass('checked');
 })
 
 
 // or what I ended up using on rooflight:
 	// toggle second tier visible ON click
	$secondTier.children('.dropdown-toggle').on('click', function(e){
		
		var clicked = $(this);
		var dataID = $(this).attr('data-id');
		var clearShow = $('.dropdown__child > .dropdown-menu');

		e.stopPropagation();
		e.preventDefault();

		console.log('saved');

		// hide any open dropdowns
		clearShow.removeClass('show');

		// open dropdown-menu that was clicked
		clicked.siblings('.dropdown-menu').toggleClass('show');

	});