HIX S-450 Auto-Open Clamshell Heat Press 15" x 15"HIX S 450 Auto Open Clamshell Heat Press Automatic Release Offers Extra Resources for High Traffic Shops The NEW HIX EVO PRO S Series is built off the time tested HT models. The S series adds a mechanical auto open feature without the need for an air compressor that reduces operator fatigue by eliminating half of the manual effort. The auto open feature reduces the chance of scorched t shirts and is helpful with longer transfer times such as