# Infant car seats and top tether use Which infant car seats need a top tether for a safe installation? Cybex Callisto G 360 Select: The Anti\-Rebound Base and SecureFix360 Tether are designed to minimise movement in a crash\. Cybex Callisto G 360: The reviewer walks through a vehicle\-belt installation that loops the base tether under the headrest, routes the belt through the base and closes the tensioner door, and says the seat is then installed quickly\. None of the checked facts state that a top tether is required for any of these seats, so confirm the tether requirement in the manual for the exact seat\. ### 1. [Cybex Callisto G 360 Select](/products/ucp/megababiesusa-com/8996785979646) (sold by megababiesusa\.com) The Anti\-Rebound Base and SecureFix360 Tether are designed to minimise movement in a crash\. - Tether: The Anti\-Rebound Base and SecureFix360 Tether are designed to minimise movement in a crash\. (listing) - Installation method: The owner's manual names lap/shoulder belt installation as the preferred method\. (manual) ### 2. [Cybex Callisto G 360](/products/ucp/megababiesusa-com/8689832395006) (sold by megababiesusa\.com) The reviewer walks through a vehicle\-belt installation that loops the base tether under the headrest, routes the belt through the base and closes the tensioner door, and says the seat is then installed quickly\. - Tether: The reviewer walks through a vehicle\-belt installation that loops the base tether under the headrest, routes the belt through the base and closes the tensioner door, and says the seat is then installed quickly\. (review) - Installation method: The reviewer walks through a vehicle\-belt installation that loops the base tether under the headrest, routes the belt through the base and closes the tensioner door, and says the seat is then installed quickly\. (review) Every value in the table is a fact RoboTrunk checked, linked to the page it came from\. A dash means no checked fact fills that cell\. Prices and stock change, so this page prints neither: each product name links to its RoboTrunk page, which shows them live\. Written 2026-10-20T07:39:26.729Z. This page is published by RoboTrunk, a store built for shopping agents. The store named on this page sells the product and ships it. RoboTrunk is not the seller and never holds the money. Buying works in one path. RoboTrunk's tools prepare a checkout at that store, then hand back a short-lived link. The person approves the total; once RoboTrunk has checked the store's total against it, the person is given the checkout link to tap in their own browser, or, if the person prefers and gives permission, their agent may open the link and finish there, and payment always happens on the store's own checkout page. RoboTrunk never takes the payment or sees a card. Where the rest of this site is: - /agent/story.md is what RoboTrunk is and how it works, in full. - /agent/tools.json is every tool, its arguments and its answers. - /agent/merchants is every store you can buy from through RoboTrunk. - /products/ucp is every store's indexed products. - /products/search is one search across every store, in plain words. - [What RoboTrunk is](/agent/story.md) - [Every tool, in your browser through WebMCP](/agent) - [The tools and how to call them](/agent/tools.json) - [The stores you can buy from](/agent/merchants) - [Every store's products](/products/ucp) - [Search every store at once](/products/search)