Check the listing for details. Paratendin Opera Acavallo Front H.B Gel Lined With Elasticated Tendon Boot. Color: Brown, Condition: New. Listed at 238.66 USD. The ACAVALLO OPERA boots have a gel lining and snap buttons. They are a perfect combination of innovation, functionality, creativity and Italian design. Furthermore, the internal part of the boots is completely made of soft neoprene with gel lining, for incredible comfort and with a protective effect on the tendons. The ventilation system ensures air circulation to help paws from overheating. Finally, the boots, in addition to being functional, are very elegant thanks to the new revolutionary plastic injection system which allows for precious graphics and the use of bright colors to combine with the other vestments of the riding outfit. Gamaschen in der bewährten und bereits beschriebenen Opera-Bauweise, jedoch with alternativer Verschlusstechnik in Form von zwei Gummizugstrippen mit Knöpf.