I know NOTHING about those particular ear muffs, but typically so many fewer rounds are discharged when hunting, than when on the range, that the total exposure to hearing is much less. And you are somewhat less likely to have other shooters near you.
At 140 dBA noise causes immediate injury to almost any unprotected ear.
.223, 55GR. Commercial load 18" barrel 155.5dB
.243 in 22" barrel 155.9dB
.30-30 in 20" barrel 156.0dB.
7mm Magnum in 20" barrel 157.5dB.
.308 in 24" barrel 156.2dB.
.30-06 in 24" barrel 158.5dB. In 18" barrel 163.2dB.
.375 18" barrel with muzzle brake 170 dB.
.410 Bore 28" barrel 150dB. 26" barrel 150.25dB. 18" barrel 156.30dB.
20 Gauge 28" barrel 152.50dB. 22" barrel 154.75dB.
12 Gauge 28" barrel 151.50dB. 26" barrel 156.10dB. 18" barrel 161.50dB.
.25 ACP 155.0 dB.
.32 LONG 152.4 dB.
.32 ACP 153.5 dB.
.380 157.7 dB.
I can't afford to lose any more hearing, if it can be helped.
fewer rounds are discharged when hunting,
Plus at ranges you typically have hard surfaces (walls, floors, etc) and they are typically enclosed. Even outdoor ranges have more hard surfaces then normal hunting areas. Thus in a hunting environment there is less sound bouncing back at you; it can disburse.
Most people use no hearing protection when hunting, with no ill effects.