diff --git a/modules/tripleliftBidAdapter.js b/modules/tripleliftBidAdapter.js
index 625b5e253f59..795c75ef9bc1 100644
--- a/modules/tripleliftBidAdapter.js
+++ b/modules/tripleliftBidAdapter.js
@@ -22,7 +22,6 @@ export const tripleliftAdapterSpec = {
 
     tlCall = utils.tryAppendQueryString(tlCall, 'lib', 'prebid');
     tlCall = utils.tryAppendQueryString(tlCall, 'v', '$prebid.version$');
-    // tlCall = utils.tryAppendQueryString(tlCall, 'fe', _isFlashEnabled().toString());
     tlCall = utils.tryAppendQueryString(tlCall, 'referrer', referrer);
 
     if (bidderRequest && bidderRequest.timeout) {
@@ -93,7 +92,8 @@ function _buildPostBody(bidRequests) {
 }
 
 function _sizes(sizeArray) {
-  return sizeArray.map(function(size) {
+  let sizes = sizeArray.filter(_isValidSize);
+  return sizes.map(function(size) {
     return {
       w: size[0],
       h: size[1]
@@ -101,6 +101,10 @@ function _sizes(sizeArray) {
   });
 }
 
+function _isValidSize(size) {
+  return (size.length === 2 && typeof size[0] === 'number' && typeof size[1] === 'number');
+}
+
 function _buildResponseObject(bidderRequest, bid) {
   let bidResponse = {};
   let width = bid.width || 1;
@@ -125,16 +129,4 @@ function _buildResponseObject(bidderRequest, bid) {
   return bidResponse;
 }
 
-// function _isFlashEnabled() {
-//   let flash;
-//   try {
-//     flash = Boolean(new ActiveXObject('ShockwaveFlash.ShockwaveFlash'));
-//   } catch (e) {
-//     flash = navigator.mimeTypes &&
-//       navigator.mimeTypes['application/x-shockwave-flash'] !== undefined &&
-//       navigator.mimeTypes['application/x-shockwave-flash'].enabledPlugin ? 1 : 0
-//   }
-//   return flash ? 1 : 0;
-// }
-
 registerBidder(tripleliftAdapterSpec);
diff --git a/test/spec/modules/tripleliftBidAdapter_spec.js b/test/spec/modules/tripleliftBidAdapter_spec.js
index c7c023ed7266..ed343f1ebf98 100644
--- a/test/spec/modules/tripleliftBidAdapter_spec.js
+++ b/test/spec/modules/tripleliftBidAdapter_spec.js
@@ -61,7 +61,7 @@ describe('triplelift adapter', () => {
           floor: 1.0,
         },
         adUnitCode: 'adunit-code',
-        sizes: [[300, 250], [300, 600]],
+        sizes: [[300, 250], [300, 600], [1, 1, 1], ['flex']],
         bidId: '30b31c1838de1e',
         bidderRequestId: '22edbae2733bf6',
         auctionId: '1d1a030790a475',
@@ -73,6 +73,12 @@ describe('triplelift adapter', () => {
       expect(request).to.exist.and.to.be.a('object');
     });
 
+    it('should only parse sizes that are of the proper length and format', () => {
+      const request = tripleliftAdapterSpec.buildRequests(bidRequests);
+      expect(request.data.imp[0].banner.format).to.have.length(2);
+      expect(request.data.imp[0].banner.format).to.deep.equal([{w: 300, h: 250}, {w: 300, h: 600}]);
+    });
+
     it('should be a post request and populate the payload', () => {
       const request = tripleliftAdapterSpec.buildRequests(bidRequests);
       const payload = request.data;