diff --git a/modules/betweenBidAdapter.js b/modules/betweenBidAdapter.js
index 5ad78a6bdc6..521c6cb6f98 100644
--- a/modules/betweenBidAdapter.js
+++ b/modules/betweenBidAdapter.js
@@ -1,5 +1,5 @@
 import {registerBidder} from '../src/adapters/bidderFactory.js';
-
+import { getAdUnitSizes, parseSizesInput } from '../src/utils.js';
 const BIDDER_CODE = 'between';
 
 export const spec = {
@@ -13,7 +13,7 @@ export const spec = {
    * @return boolean True  if this is a valid bid, and false otherwise.
    */
   isBidRequestValid: function(bid) {
-    return !!(bid.params.w && bid.params.h && bid.params.s);
+    return Boolean(bid.params.s);
   },
   /**
    * Make a server request from the list of BidRequests.
@@ -27,13 +27,12 @@ export const spec = {
 
     validBidRequests.forEach(i => {
       let params = {
+        sizes: parseSizesInput(getAdUnitSizes(i)),
         jst: 'hb',
         ord: Math.random() * 10000000000000000,
         tz: getTz(),
         fl: getFl(),
         rr: getRr(),
-        w: i.params.w,
-        h: i.params.h,
         s: i.params.s,
         bidid: i.bidId,
         transactionid: i.transactionId,
diff --git a/modules/betweenBidAdapter.md b/modules/betweenBidAdapter.md
index 426d0aa2ed7..4aadd31d3a3 100644
--- a/modules/betweenBidAdapter.md
+++ b/modules/betweenBidAdapter.md
@@ -15,14 +15,17 @@ About us : http://betweendigital.com
 ```javascript
     var adUnits = [
         {
-            code: 'test-div',
+						code: 'ad_slot',
+						mediaTypes: {
+                banner: {
+                    sizes: [[970, 250], [240, 400], [728, 90]]
+                }
+            },
             bids: [
                 {
                     bidder: "between",
                     params: {
-                        w: 200,
-                        h: 400,
-                        s: 111
+                        s: 122938
                     }
                 }
             ]
@@ -45,14 +48,16 @@ Where:
         var PREBID_TIMEOUT = 700;
 
         var adUnits = [{
-          code: 'example',
-          sizes: [[300, 250], [200,400]],
+					code: 'example',
+					mediaTypes: {
+                banner: {
+                    sizes: [[970, 250], [240, 400], [728, 90]]
+                }
+          },
           bids: [{
             bidder: 'between',
             params: {
-              w: 240,
-              h: 400,
-              s: 8
+              s: 809832
             }
           }]
 
diff --git a/test/spec/modules/betweenBidAdapter_spec.js b/test/spec/modules/betweenBidAdapter_spec.js
index 3a6be953d7b..5dff32ca4d8 100644
--- a/test/spec/modules/betweenBidAdapter_spec.js
+++ b/test/spec/modules/betweenBidAdapter_spec.js
@@ -201,4 +201,24 @@ describe('betweenBidAdapterTests', function () {
     expect(syncs).to.be.an('array').that.to.have.lengthOf(1);
     expect(syncs[0]).to.deep.equal({type: 'iframe', url: 'https://ads.betweendigital.com/sspmatch-iframe'});
   });
+
+  it('check sizes', function() {
+    let bidRequestData = [{
+      bidId: 'bid1234',
+      bidder: 'between',
+      mediaTypes: {
+        banner: {
+          sizes: [[970, 250], [240, 400], [728, 90]]
+        }
+      },
+      params: {
+        s: 1112,
+      },
+    }];
+
+    let request = spec.buildRequests(bidRequestData);
+    let req_data = request[0].data;
+
+    expect(req_data.sizes).to.deep.equal(['970x250', '240x400', '728x90']);
+  });
 });