Here at Bradshaws Direct we have introduced a price match so you can buy with complete confidence. Have you seen Permalay Pond Underlay cheaper elsewhere? Give us a call & we will match that price. We searched high & low for the right material to replace our old underlay & this is it! We've taken a product that is used under reservoirs & adapted it for use in the garden pond. Incredibly strong easy to lay & made to last a lifetime Permalay will protect your liner for years to come. Puncture & tear resistant giving long lasting support for your liner Flexible to mould to the contours of your pond Standard Underlay is sold in sizes which compliment the Polyex Liners. eg if you need a liner 6m x 5m simply choose the same size for your underlay.